In the months before the mass shooting in a Colorado movie theater, James Holmes withdrew from his already small social circle into a near solitary existence.

His limited interactions with other neuroscience students during this phase of heightened isolation included showing off a semiautomatic gun to one and sending a text message in which he suggested he was afflicted by a form of bipolar disorder, according to a detailed report by The New York Times.

While Holmes' behavior was troubling to University of Colorado classmates and officials who spoke to The Times, it appears none of them feared he would harm others.

Still, about two weeks before the July 20 rampage at a midnight screening of "The Dark Knight Rises," he warned a fellow grad student via a text message to stay away from him, "because I am bad news."

That admonition came after Holmes, 24, questioned the unnamed woman about dysphoric mania, a form of bipolar disorder, The Times learned. During the back-and-forth messaging, Holmes suggested that he had controlled the disorder by taking medication.

In May, Holmes displayed a semiautomatic Glock pistol and told another student he bought it to protect himself, according to The Times. The weapon could have been one of the four that prosecutors allege was part of the arsenal that Holmes amassed over several months.

The latest fragments revealed about Holmes -- the suspect in last month's shooting that left 12 people dead and 58 wounded in Aurora -- depict a loner, but do not pinpoint a particular motive for the outburst of violence.

Classmates and neighbors have previously said that Holmes was painfully shy, averted eye contact and prone to socially awkward statements. Yet until this spring when his personality darkened, others could still coax a pleasant remark from him.

The search for an explanation has been elusive. Arapahoe County District Chief Judge William Sylvester issued a gag order preventing the release of some documents about Holmes. His parents have declined to speak about him.

His psychiatrist, Dr. Lynne Fenton, who reportedly voiced concerns about him to a university safety committee and asked the campus police to check for a criminal record, has also kept silent.

But prosecutors trying to prove that Holmes carefully planned the shooting allege that he told a student in March that he wanted to kill people. They also contend that Holmes threatened a professor in June around the time he flunked an oral exam and dropped out of the program.

Earlier on HuffPost:

Loading Slideshow...
  • Rebecca Ann Wingo

    This undated photo provided by the family shows Rebecca Ann Wingo. Wingo, 32, was one of the victims killed in the Friday, July 20, 2012 movie theater shooting in Aurora, Colo. (AP Photo)

  • The undated photo provided by the family shows Alex Teves. Teves, 24, was one of the victims killed in the Friday, July 20, 2012 movie theater shooting in Aurora, Colo. (AP Photo/Teves Family)

  • Jessica Ghawi

    This undated photo provided by the family shows Jessica Ghawi. Ghawi is one of the 12 people killed when a gunman barged into a crowded theater, set off gas canisters and opened fire as spectators dove for cover and tried to flee, Friday, July 20, 2012, in Aurora, Colo. Dozens of others were injured, including 11 in critical condition. (AP Photo/Courtesy of the family)

  • This undated photo provided by the Larimer family shows John Larimer. Relatives have identified Larimer, a U.S. Navy sailor, as one of the victims killed by a gunman at a showing of the new Batman movie, early Friday, July 20, 2012, in Aurora, Colo. (AP Photo/Larimer family)

  • This undated photo provided by Robert Sullivan shows Veronica Moser-Sullivan, the youngest person slain in the July 20 attack that left 12 dead and dozens wounded during the Aurora theater shootings. Robert Sullivan, Veronica's grandfather, wants a thief to return pictures of the child that were stolen from his home in a burglary this week. He said Wednesday, Oct. 3, 2012 that four cameras were stolen, including one that had a memory card with more than 40 photos of Veronica at a school celebration. Other images show her at a playground. (AP Photo/Robert Sullivan)

  • This undated photo provided by the family shows Jonathan T. Blunk, 26, of Aurora, Colo. with his two children. Blunk was one of the victims in the Friday, July 20, 2012 Aurora, Colo. movie theater shooting. (AP Photo)

  • This undated photo provided by the U.S. Air Force shows Jesse Childress. The 29-year-old, from Thornton, Colo., was one of the victims in the Friday, July 20, 2012 Aurora, Colo. movie theater shooting. Childress was an Air Force cyber-systems operator based at Buckley Air Force Base in Aurora. (AP Photo/U.S. Air Force)

  • Alexander J. Boik

    This undated image provided by the family shows Alexander J. Boik, known as AJ. Boik was one of the victims in the Friday, July 20, 2012 Aurora, Colo. movie theater shooting. (AP Photo)

  • Matt McQuinn, Samantha Yowler

    This undated photo provided by the family shows Matt McQuinn, left, and Samantha Yowler. McQuinn was killed and Yowler was wounded in the Friday, July 20, 2012 Aurora, Colo., movie theater shooting. (AP Photo)

  • This photo provided by the family shows Micayla Medek. Medek, 23, is one of the 12 people killed when a gunman barged into a crowded theater, set off gas canisters and opened fire as spectators dove for cover and tried to flee, Friday, July 20, 2012, in Aurora, Colo. Dozens of others were injured, including 11 in critical condition. (AP Photo/Courtesy of the family)

  • A tribute to movie theater shooting victim AJ Boik, is shown along with his photo, on a message table Saturday, July 21, 2012, at a vigil at Gateway High School in Aurora, Colo., Boik, was a student at the school and was killed along with 11 others when a gunman opened fire in a movie theater. (AP Photo/Ted S. Warren)

  • This photo provided by The Cowden Family shows shooting victim Gordon W. Cowden. Twelve people were killed and dozens were injured in the attack early Friday, July 20, 2012 at the packed theater during a showing of the Batman movie, "The Dark Knight Rises." in Aurora, Colo. Police have identified the suspected shooter as James Holmes, 24. (AP Photo/The Cowden Family)

  • Jonathan Blunk, Jesse Childress, Gordon Cowden, Jessica Ghawi, John Larimer, Micayla Medek, Alex Sullivan

    This combination of photos provided by their families shows seven of the 12 victims in the Friday, July 20, 2012 Aurora, Colo. movie theater shooting. Top row from left are Jonathan Blunk, Jesse Childress, Gordon Cowden, Jessica Ghawi, and bottom row from left, John Larimer, Micayla Medek, Alex Sullivan. (AP Photo)

  • This Sept. 20, 2011 photo provided by The Sullivan Family, shows shooting victim Alex Sullivan. Twelve people were killed and dozens were injured in the attack early Friday, July 20, 2012 at the packed theater during a showing of the Batman movie, "The Dark Knight Rises." in Aurora, Colo. Police have identified the suspected shooter as James Holmes, 24. (AP Photo/The Sullivan Family)

  • The Bass Pro Shops store in Denver, Colo. is shown, Saturday, July 21, 2012. The is store is where the gunman in Friday's movie theater shooting in Aurora, Colo., allegedly purchased two of his weapons. (AP Photo/Ted S. Warren)

  • The Gander Mountain store in Aurora, Colo. is shown, Sunday, July 22, 2012. The is store is where the gunman in Friday's movie theater shooting allegedly purchased one of his weapons. (AP Photo/Ted S. Warren)

  • Tom Sullivan , holds a photograph of his son, Alex Sullivan, as he pleads with the media to help him find his son, outside Gateway High School on Friday, July 20, 2012 in Aurora, Colo. Alex Sullivan, was celebrating his 27th birthday by attending midnight premiere of the Batman movie Friday night. A gunman wearing a gas mask set off an unknown gas and fired into the crowded movie theater killing 12 people and injuring at least 50 others, authorities said. (Photo credit: AP Photo/Barry Gutierrez)

  • A woman cries outside Gateway High School where witness were brought for questioning after a gunman opened fire at a midnight premiere of The Dark Knight Rises Batman movie Friday, July 20, 2012 in Aurora, Colo. A gunman wearing a gas mask set off an unknown gas and fired into the crowded movie theater killing 12 people and injuring at least 50 others, authorities said. (Photo credit: AP Photo/Barry Gutierrez)

  • Tom Sullivan, center, embraces family members outside Gateway High School where he has been searching franticly for his son Alex Sullivan who celebrated his 27th birthday by going to see "The Dark Knight Rises," movie where a gunman opened fire Friday, July 20, 2012, in Aurora, Colo. (Photo credit: AP Photo/Barry Gutierrez)

  • Eyewitness Chandler Brannon, 25, sits outside Gateway High School where witnesses were brought for questioning after a shooting at a movie theater showing the Batman movie "The Dark Knight Rises," Friday, July 20, 2012 in Aurora. A gunman wearing a gas mask set off an unknown gas and fired into the crowded movie theater killing 12 people and injuring at least 50 others, authorities said. (Photo credit: AP Photo/Barry Gutierrez)

  • A small group prays outside Gateway High School where witness were brought for questioning Friday, July 20, 2012 in Aurora, Colo. A gunman wearing a gas mask set off an unknown gas and fired into the crowded movie theater killing 12 people and injuring at least 50 others, authorities said. (Photo credit: AP Photo/Barry Gutierrez)

  • Family and friends wait outside Gateway High School where witnesses were brought for questioning after a shooting at a movie theater showing the Batman movie "The Dark Knight Rises," Friday, July 20, 2012 in Aurora, Colo. A gunman wearing a gas mask set off an unknown gas and fired into the crowded movie theater killing 12 people and injuring at least 50 others, authorities said. (Photo credit: AP Photo/Barry Gutierrez)

  • Eyewitness Jacob Stevens, 18, hugs his mother Tammi Stevens after being interview by police outside Gateway High School where witnesses were brought for questioning Friday, July 20, 2012 in Aurora, Colo. A gunman wearing a gas mask set off an unknown gas and fired into the crowded movie theater killing 12 people and injuring at least 50 others, authorities said. (Photo credit: AP Photo/Barry Gutierrez)

  • Eyewitness Isaiah Bow hugs his mother Shamecca Davis after being questioned by police outside Gateway High School where witnesses were brought in, Friday, July 20, 2012 in Aurora, Colo. After leaving the theater Bow went back in to find his girlfriend. "I didn't want to leave her in there. But she's ok now," Bow said. A gunman wearing a gas mask set off an unknown gas and fired into the crowded movie theater killing 12 people and injuring at least 50 others, authorities said. (Photo credit: AP Photo/Barry Gutierrez)

  • Emma Goos, 19, hugs her mother, Judy Goos, outside Gateway High School where witnesses were brought for questioning Friday, July 20, 2012, in Aurora, Colo. Emma was in the third row of the theater of the new Batman movie when the shooter entered. She helped apply pressure to a man's head who was injured. (Photo credit: AP Photo/Barry Gutierrez)

  • Police cars in front of the Century 16 theater in Aurora, Colorado where a gunman opened fire during the opening of the new Batman movie "The Dark Knight Rises" killing at least 15 people and wounding 50 others on the morning of July 20, 2012. The shooting suspect in custody after at least 12 people were shot dead and around 50 were wounded at a movie screening in the United States has been identified as 24-year-old James Holmes, US media said Friday. Television networks cited the FBI as saying that Holmes, from the town of Aurora, Colorado, scene of the midnight shooting at a screening of the Batman movie "The Dark Knight Rises," did not appear to have any known terrorism connections. (Photo credit: AFP PHOTO/JONATHAN CASTNER JONATHAN CASTNER/AFP/GettyImages)

  • Police tape cordons off the parking area around the Century 16 movie theater in Aurora, Colorado, July 20, 2012 where a gunman opened fire during the showing of the new Batman movie. At least 12 people were killed and around 50 wounded in the cinema shooting. (Photo credit: AFP PHOTO JONATHAN CASTNERJONATHAN CASTNER/AFP/GettyImages)

  • Police cars in front of the Century 16 theater in Aurora, Colorado where a gunman opened fire during the opening of the new Batman movie "The Dark Knight Rises" killing at least 15 people and wounding 50 others on the morning of July 20, 2012. The shooting suspect in custody after at least 12 people were shot dead and around 40 were wounded at a movie screening in the United States has been identified as 24-year-old James Holmes, US media said Friday. Television networks cited the FBI as saying that Holmes, from the town of Aurora, Colorado, scene of the midnight shooting at a screening of the Batman movie "The Dark Knight Rises," did not appear to have any known terrorism connections. (Photo credit: AFP PHOTO/JONATHAN CASTNERJONATHAN CASTNER/AFP/GettyImages)

  • Police cars in front of the Century 16 theater in Aurora, Colorado where a gunman opened fire during the opening of the new Batman movie "The Dark Knight Rises" killing at least 15 people and wounding 50 others on the morning of July 20, 2012. The shooting suspect in custody after at least 12 people were shot dead and around 50 were wounded at a movie screening in the United States has been identified as 24-year-old James Holmes, US media said Friday. Television networks cited the FBI as saying that Holmes, from the town of Aurora, Colorado, scene of the midnight shooting at a screening of the Batman movie "The Dark Knight Rises," did not appear to have any known terrorism connections. (Photo credit: AFP PHOTO/JONATHAN CASTNERJONATHAN CASTNER/AFP/GettyImages)

  • Police cars are seen in the parking area around the Century 16 movie theater in Aurora, Colorado, July 20, 2012 where a gunman opened fire during the showing of the new Batman movie. At least 12 people were killed and around 50 wounded in the cinema shooting. (Photo credit: AFP PHOTO JONATHAN CASTNERJONATHAN CASTNER/AFP/GettyImages)

  • Police use a video camera to look inside an apartment where the suspect in a shooting at a movie theatre lived in Aurora, Colo., Friday, July 20, 2012. As many as 12 people were killed and 50 injured at a shooting at the Century 16 movie theatre early Friday during the showing of the latest Batman movie. (Photo credit: AP Photo/Ed Andrieski)

  • Police break out a window of an apartment where the suspect in a shooting at a movie theatre lived in Aurora, Colo., Friday, July 20, 2012. As many as 12 people were killed and 50 injured at a shooting at the Century 16 movie theatre early Friday during the showing of the latest Batman movie. (Photo credit: AP Photo/Ed Andrieski)

  • Shamecca Davis hugs her son Isaiah Bow, who was an eye witness to the shooting, outside Gateway High School where witness were brought for questioning Friday, July 20, 2012 in Denver. After leaving the theater Bow went back in to find his girlfriend. " I didn't want to leave her in there. But she's ok now," Bow said. A gunman wearing a gas mask set off an unknown gas and fired into a crowded movie theater at a midnight opening of the Batman movie "The Dark Knight Rises," killing at least 12 people and injuring at least 50 others, authorities said. (Photo credit: AP Photo/Barry Gutierrez)

  • Judy Goos, second from left, hugs her daughters friend, Isaiah Bow, 20, while eye witnesses Emma Goos, 19, left, and Terrell Wallin, 20, right, gather outside Gateway High School where witness were brought for questioning Friday, July 20, 2012 in Denver. A gunman wearing a gas mask set off an unknown gas and fired into a crowded movie theater at a midnight opening of the Batman movie "The Dark Knight Rises," killing at least 12 people and injuring at least 50 others, authorities said. (Photo credit: AP Photo/Barry Gutierrez)

  • A SWAT team officer stands watch near an apartment house where the suspect in a shooting at a movie theatre lived in Aurora, Colo., Friday, July 20, 2012. As many as 14 people were killed and 50 injured at a shooting at the Century 16 movie theatre early Friday during the showing of the latest Batman movie. (Photo credit: AP Photo/Ed Andrieski)

  • Police gather near an apartment house where the suspect in a shooting at a movie theatre lived in Aurora, Colo., Friday, July 20, 2012. As many as 12 people were killed and 50 injured at a shooting at the Century 16 movie theatre early Friday during the showing of the latest Batman movie. (Photo credit: AP Photo/Ed Andrieski)

  • A SWAT team officer stands watch near an apartment house where the suspect in a shooting at a movie theatre lived in Aurora, Colo., Friday, July 20, 2012. As many as 12 people were killed and 50 injured at a shooting at the Century 16 movie theatre early Friday during the showing of the latest Batman movie. (Photo credit: AP Photo/Ed Andrieski)

  • Jacob Stevens, 18, hugs his mother Tammi Stevens after being interview by police outside Gateway High School where witness were brought for questioning after a shooting at a movie theater, Friday, July 20, 2012 in Denver. A gunman wearing a gas mask set off an unknown gas and fired into a crowded movie theater at a midnight opening of the Batman movie "The Dark Knight Rises," killing at least 12 people and injuring at least 50 others, authorities said. (Photo credit: AP Photo/Barry Gutierrez)

  • (Credit: Sky News)

  • (Credit: Sky News)

  • (Credit: Sky News)

  • (Credit: Sky News)

  • Police are pictured outside of a Century 16 movie theatre where as many as 12 people were killed and many injured at a shooting during the showing of a movie at the in Aurora, Colo., Friday, July 20, 2012. (Photo credit: AP Photo/Ed Andrieski)

  • Police are pictured outside of a Century 16 movie theatre where as many as 12 people were killed and many injured at a shooting during the showing of a movie at the in Aurora, Colo., Friday, July 20, 2012. (Photo credit: AP Photo/Ed Andrieski)

  • Aurora Police Chief Daniel Oates talks to media at Aurora Mall where as many as 12 people were killed and many injured at a shooting at the Century 16 movie theatre in Aurora, Colo., Friday, July 20, 2012. (Photo credit: AP Photo/Ed Andrieski)

  • Aurora Police Chief Daniel Oates talks to media at the Aurora Mall where as many as 14 people were killed and many injured at a shooting at the Century 16 movie theatre in Aurora, Colo., Friday, July 20, 2012. (Photo credit: AP Photo/Ed Andrieski)

  • Police are pictured outside of a Century 16 movie theatre where as many as 12 people were killed and many injured at a shooting during the showing of a movie at the in Aurora, Colo., Friday, July 20, 2012. (Photo credit: AP Photo/Ed Andrieski)

  • Police are pictured outside of a Century 16 movie theatre where as many as 12 people were killed and many injured at a shooting during the showing of a movie at the in Aurora, Colo., Friday, July 20, 2012. (Photo credit: AP Photo/Ed Andrieski)

  • People gather outside the Century 16 movie theatre in Aurora, Colo., at the scene of a mass shooting early Friday morning, July 20, 2012. Police Chief Dan Oates says 12 people are dead following the shooting at the suburban Denver movie theater. He says 50 others were injured when gunfire erupted early Friday at the Aurora theater. Oates says a gunman appeared at the front of one of the Century 16 theaters. <em>Photo Credit: Karl Gehring, <a href="http://www.huffingtonpost.com/news/exposure/" target="_hplink">Denver Post</a>. </em> / AP

  • (Photo credit: 7NewsMorning/Twitter)