DALLAS — Maj. Nidal Hasan will stand trial in a court-martial that starts Tuesday for the shooting rampage at Fort Hood that left 13 people dead and more than 30 people wounded at the Texas Army post on Nov. 5, 2009.

Here are some details about the case so far and what to expect from the trial:

WHAT CHARGES DOES HASAN FACE?

Hasan faces 13 specifications of premeditated murder and 32 specifications of attempted premeditated murder under the Uniform Code of Military Justice. If convicted, he would face the death penalty.

WHY HAS THE CASE TAKEN SO LONG TO PROSECUTE?

Judges in the case have granted a series of delays for preparation or other issues, often at the request of Hasan or his attorneys. A fight over Hasan's beard, which violates military regulations, led to a stay shortly before the trial was expected to begin last year and the eventual replacement of the judge. Legal experts have said authorities are doing their best to avoid mistakes that could lead to a reversal of any guilty verdict, noting that Hasan would have multiple mandatory appeals if he's found guilty of murder and sentenced to death. Military appeals courts have overturned most death sentences they've seen in the last three decades.

WHAT WILL THE VICTIMS SAY AT TRIAL?

Many of those wounded in the attack are expected to testify. Some of them have already described that day in open court, during a hearing three years ago to determine whether Hasan would stand trial. One victim, Spc. Alan Carroll, recalled playing dead so Hasan wouldn't shoot him again. Another, Staff Sgt. Alonzo Lunsford, said he remembered a woman shouting about the gunman: "He's one of ours! He's one of ours!"

WHAT WILL HASAN SAY?

Hasan is representing himself at trial. He wanted to argue that he carried out the shooting in "defense of others" – namely, Muslim insurgents fighting American soldiers in Afghanistan – but the judge, Col. Tara Osborn, denied that strategy. Osborn has also told him that he will not be able to make speeches about his beliefs or try to testify himself when he's questioning witnesses.

WHAT IS HASAN'S PHYSICAL CONDITION?

Hasan was shot in the back by officers responding to the shootings. He is now paralyzed from the waist down, confined to a wheelchair, uses a catheter and wears adult diapers. His doctor testified earlier this year that Hasan cannot sit upright for more than 12 hours a day without his concentration being affected, requiring testimony to conclude each day by 5 p.m. at the latest since inmates at his jail wake up before dawn. Hasan also requires 15- to 20-minute stretching breaks about every four hours, and has to lift himself off his wheelchair for about a minute every half hour to avoid developing sores.

IS HASAN STILL CONSIDERED A SOLDIER?

Yes. He has retained his rank of major and his salary even in jail. Recently, he has worn a camouflage uniform in court instead of the dress uniform defendants typically wear in a court-martial. Osborn has said the camouflage uniform is easier for him to wear as a paraplegic.

HOW DOES A MILITARY COURT-MARTIAL DIFFER FROM A CIVILIAN CRIMINAL TRIAL?

The judge, the prosecutors and the attorneys standing by to help Hasan are military officers, as are the 13 jurors, who range in rank from colonel to major. The jurors must be unanimous to find Hasan guilty of premeditated murder. If that happens, Hasan's case would quickly proceed to a capital sentencing hearing, where prosecutors try to prove one or more aggravating factors that merit a death sentence. One aggravating factor would be the killing of more than one person in an incident. Jurors must be unanimous to sentence him to death. However, three-quarters of the jury must vote yes to convict Hasan for attempted murder. The military courts system also does not have hung juries: If one of the 13 jurors votes Hasan not guilty of murder, he would be declared not guilty.

WHAT HAPPENS IF HE'S SENTENCED TO DEATH?

The death sentence would need to be affirmed by Fort Hood's commanding authority, which would prompt automatic appeals at two military courts for the Army and then the armed forces. If those fail, Hasan could ask the U.S. Supreme Court to review his case and file motions in federal court. The U.S. president must eventually approve a military death sentence.

Five condemned soldiers are currently on the military death row at Fort Leavenworth, Kan. If their cases are any guide, it would likely be decades before Hasan were executed. Many death row inmates have had their sentences overturned on appeal, and no active-duty soldier has been executed in the military system since 1961.

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  • Nidal Hasan

    FILE - This undated file photo provided by the Bell County Sheriff's Department via The Temple Daily Telegram shows Nidal Hasan, the Army psychiatrist charged in the deadly 2009 Fort Hood shooting. Hasan should be forced to shave his beard to avoid any potential jury bias in his pending murder trial, say some military experts and the judge overseeing his pending court-martial. (AP Photo/Bell County Sheriff's Department via The Temple Daily Telegram, File)

  • Nidal Hasan

    FILE - An April 9, 2010 file photo provided by the Bell County Sheriffs Department, shows U.S. Maj. Nidal Hasan at the San Antonio to Bell County Jail in Belton, Texas. Judge, Col. Gregory Gross, is to decide at a pretrial hearing Tuesday Aug. 14, 2012, whether to delay the trial of Hasan. (AP Photo/Bell County Sheriffs Department, File)

  • Nidal Malik Hasan

    FILE - The 2007 file photo provided by the Uniformed Services University of the Health Sciences (USUHS) shows Nidal Malik Hasan when he undertook the Disaster and Military Psychiatry Fellowship program. Hasan is charged in the fatal 2009 shooting rampage at Fort Hood which killed 13 people and injured more that 30 others. He faces the death penalty if convicted. (AP Photo/Uniformed Services University of the Health Sciences, File)

  • Fort Hood Shooting

    Maj. Laura Suttinger of the 467th Combat Stress Control Detachment shows a bracelet at a press conference Saturday, Oct. 30, 2010, in Madison, Wis. The bracelet commemorates soldiers who were killed on Nov. 5, 2009, at Fort Hood in Killeen, Texas, during a shooting rampage suspect Maj. Nidal Hasan. (AP Photo/Andy Manis)

  • Fort Hood Shooting

    FILE - In this Nov. 5, 2009 file photo, the entrance to Fort Hood Army Base in Fort Hood, Texas, near Killeen is seen. Eighty-three victims and family members in the worst mass shooting ever at a U.S. military installation are seeking $750 million in compensation from the Army, alleging that willful negligence enabled psychiatrist Maj. Nidal Hasan to carry out a terrorist attack at Fort Hood, Texas. (AP Photo/Jack Plunkett, File)

  • Shawn Manning

    In this Saturday, Aug. 3, 2013, photo, retired U.S. Army Staff Sgt. Shawn Manning poses for a photo, at his home in Lacey, Wash., as he holds a memorial bracelet for members of his military unit who were killed in a 2009 mass shooting at Fort Hood, Texas. Manning, who still carries two bullets in his body from the shooting that killed 13 people, is scheduled to testify at the court martial for Maj. Nidal Malik Hasan, the accused shooter this week. (AP Photo/Ted S. Warren)

  • Shawn Manning

    In this Saturday, Aug. 3, 2013, photo, retired U.S. Army Staff Sgt. Shawn Manning poses for a photo, at his home in Lacey, Wash. as he holds a photograph from the memorial for victims of a 2009 mass shooting at Fort Hood, Texas. Manning, who still carries two bullets in his body from the shooting that killed 13 people, is scheduled to testify at the court martial for Maj. Nidal Malik Hasan, the accused shooter this week. (AP Photo/Ted S. Warren)

  • Kathy Platoni

    File - In this Nov. 1, 2010 file photo from Beaver Creek Ohio, U.S. Army Col. Kathy Platoni talks of the Fort Hood, Texas shooting that took 13 lives and wounded more than 30 others. After years of delays, Platoni will come face to face with Maj. Nidal Malik Hasan, the man accused of the 2009 shooting rampage. (AP Photo/Al Behrman, File)

  • Fort Hood Shooting

    This handout photo courtesy of Eduardo Caraveo show Maj Libardo Eduardo Caraveo, who was killed during a mass shooting at Fort Hood, Texas on Nov. 5, 2009. A trial for Maj. Nidal Hasan, who is charged in the shooting rampage that left 13 dead and more than 30 others wounded, starts Tuesday, Aug. 6, 2013. (AP Photo/Courtesy of Eduardo Caraveo)

  • John Gaffaney

    File - This undated file photo provided by the Gaffaney family shows John Gaffaney, who was killed during a mass shooting at Fort Hood, Texas on Nov. 5, 2009. A trial for Maj. Nidal Hasan, who is charged in the shooting rampage that left 13 dead and more than 30 others wounded, starts Tuesday, Aug. 6, 2013. (AP Photo/Gaffaney Family)

  • Fort Hood Shooting

    This handout photo courtesy of Keely Vanacker shows Mike Cahill who was killed during a mass shooting at Fort Hood, Texas on Nov. 5, 2009. A trial for Maj. Nidal Hasan, who is charged in the shooting rampage that left 13 dead and more than 30 others wounded, starts Tuesday, Aug. 6, 2013. (AP Photo/Keely Vanacker)

  • Fort Hood Shooting

    FILE - This file combination image shows handout photos of the victims killed during the 2009 shooting rampage at Fort Hood, Texas. From top left, Michael Grant Cahill, 62, of Cameron, Texas; Maj. Libardo Eduardo Caraveo, 52, of Woodbridge, Va.; Staff Sgt. Justin M. DeCrow, 32, of Evans, Ga.; Capt. John Gaffaney, 56, of San Diego, Calif.; Spc. Frederick Greene, 29, of Mountain City, Tenn.; Spc. Jason Dean Hunt, 22, of Frederick, Okla., Sgt. Amy Krueger, 29, of Kiel, Wis.; Pfc. Aaron Thomas Nemelka, 19, of West Jordan, Utah; Pfc. Michael Pearson, 22, of Bolingbrook, Ill.; Capt. Russell Seager, 51, of Racine, Wis.; Pvt. Francheska Velez, 21, of Chicago; Lt. Col. Juanita Warman, 55, of Havre de Grace, Md.; and Pfc. Kham Xiong, 23, of St. Paul, Minn. A trial for Nidal Hasan, who is charged in the shooting rampage that left 13 dead and more than 30 others wounded, starts Tuesday, Aug. 6, 2013. (AP Photo, File)

  • Alonzo Lunsford

    In this Tuesday, June 4, 2013, photo, retired Staff Sgt. Alonzo Lunsford walks down the steps of his home in Lillington, N.C. Nearly three dozen soldiers, including Lunsford, who was wounded in the 2009 Fort Hood shooting rampage at Fort Hood, Texas are facing the prospect of being approached and questioned in court by the man many witnesses have identified as the gunman: Maj. Nidal Hasan. (AP Photo/Chuck Burton)

  • Alonzo Lunsford

    In this Tuesday, June 4, 2013, photo, photos of Staff Sgt. Alonzo Lunsford recovering from his wounds after the 2009 shooting rampage at Fort Hood, Texas are displayed on a desk at his home in Lillington, N.C. Nearly three dozen soldiers wounded in the deadly attack on the Texas Army post are facing the prospect of being approached and questioned in court by the man many witnesses have identified as the gunman: Maj. Nidal Hasan. (AP Photo/Chuck Burton)

  • Alonzo Lunsford

    In this Tuesday, June 4, 2013, photo, retired Staff Sgt. Alonzo Lunsford describes one of his wounds from the 2009 Fort Hood shooting rampage, at his home in Lillington, N.C. Nearly three dozen soldiers wounded in the deadly attack on the Texas Army post are facing the prospect of being approached and questioned in court by the man many witnesses have identified as the gunman: Maj. Nidal Hasan. (AP Photo/Chuck Burton)

  • Fort Hood Shooting

    FILE- In this July 20, 2011, file photo, U.S. Army military police walk out of the Lawrence H. Williams Judicial Center where a hearing for U.S. Army Major Nidal Hasan was being conducted in Fort Hood, Texas. Hasan is charged in the 2009 shooting rampage at Fort Hood that left 13 dead and more than 30 others wounded. Hasan doesn’t deny that he carried out the rampage, but military law prohibits him from entering a guilty plea because authorities are seeking the death penalty. If he is convicted and sentenced to death in a trial that starts Tuesday, Aug. 6, 2013, there are likely years, if not decades, of appeals ahead. (AP Photo/Tony Gutierrez, File)

  • Fort Hood Shooting

    FILE- In this Nov. 10, 2009, file photo, soldiers salute as they honor victims of the Fort Hood shooting at a memorial service at Fort Hood, Texas. Maj. Nidal Hasan is charged in the 2009 shooting rampage at Fort Hood that left 13 dead and more than 30 others wounded. Hasan doesn’t deny that he carried out the rampage, but military law prohibits him from entering a guilty plea because authorities are seeking the death penalty. If he is convicted and sentenced to death in a trial that starts Tuesday, Aug. 6, 2013, there are likely years, if not decades, of appeals ahead. (AP Photo/Donna McWilliam, File)

  • Fort Hood Shooting

    FILE - This June 11, 2013, file courtroom sketch shows U.S. Army Maj. Nidal Hasan, right, sitting by his former defense attorneys Maj. Joseph Marcee, far left, and Lt. Col. Kris Poppe, center, during a hearing at Fort Hood, Texas. Hasan is charged in the 2009 shooting rampage at Fort Hood that left 13 dead and more than 30 others wounded. Hasan doesn’t deny that he carried out the rampage, but military law prohibits him from entering a guilty plea because authorities are seeking the death penalty. If he is convicted and sentenced to death in a trial that starts Tuesday, Aug. 6, 2013, there are likely years, if not decades, of appeals ahead. (AP Photo/Brigitte Woosley, File)

  • John Rossi, Steven Braverman

    FILE- In this Nov. 6, 2009, file photo, Col. (P) John Rossi, Deputy Commander General of Fires and Effects, and Col. Steven Braverman, Commander of Carl R. Darnall Army Medical Center, address reporters during a news conference following a mass shooting at Fort Hood, Texas. Maj. Nidal Hasan is charged in the 2009 shooting rampage at Fort Hood that left 13 dead and more than 30 others wounded. Hasan doesn’t deny that he carried out the rampage, but military law prohibits him from entering a guilty plea because authorities are seeking the death penalty. If he is convicted and sentenced to death in a trial that starts Tuesday, Aug. 6, 2013, there are likely years, if not decades, of appeals ahead. (AP Photo/Killeen Daily Herald, David Morris, File)

  • Fort Hood Shooting

    FILE- In this Nov. 5, 2009, file image released by the U.S. Army, emergency workers prepare the wounded for transport in waiting ambulances near Fort Hood's Soldier Readiness Processing Center in Fort Hood, Texas. Maj. Nidal Hasan is charged in the 2009 shooting rampage at Fort Hood that left 13 dead and more than 30 others wounded. Hasan doesn’t deny that he carried out the rampage, but military law prohibits him from entering a guilty plea because authorities are seeking the death penalty. If he is convicted and sentenced to death in a trial that starts Tuesday, Aug. 6, 2013, there are likely years, if not decades, of appeals ahead. (AP Photo/U.S. Army, Jeramie Sivley, File)

  • Fort Hood Shooting

    The Lawrence H. Williams Judicial Center is shown behind a protective barrier as jury selection begins, Tuesday, July 9, 2013, in Fort Hood, Texas. An Army psychiatrist going on trial in the deadly 2009 Fort Hood shooting wants to tell potential jurors that he's being forced to wear a military uniform he believes represents "an enemy of Islam," he told a judge Tuesday. (AP Photo/Tony Gutierrez)

  • Nidal Hasan, Kris Pope, Tara Osborn, Larry Downend, Mike Mulligan, Steven Henricks

    In this courtroom sketch, U.S. Army Maj. Nidal Hasan, left sitting, sits by his former defense attorney, Lt. Col. Kris Poppe, left rear, as Judge Tara Osborn, behind bench, watches prosecutor Maj. Larry Downend, standing, question potential jurors with fellow prosecutors Col. Mike Mulligan, center front, and Col. Steven Henricks, right, looking on, Tuesday, July 9, 2013, in Fort Hood, Texas. Hasan faces execution or life without parole if convicted in the 2009 rampage that killed 13 and wounded nearly three dozen on the Texas Army post. (AP Photo/Brigitte Woosley)

  • Tara Osborn, Nidal Hasan, Joseph Marcee, Kris Poppe

    In this courtroom sketch, U.S. Army Maj. Nidal Hasan, right, sits by his former defense attorneys Maj. Joseph Marcee, far left, and Lt. Col. Kris Poppe, center, with Judge, Col. Tara Osborn, behind the bench during a pretrial hearing, Tuesday, July 9, 2013, in Fort Hood, Texas. Jury selection is set to start Tuesday in the long-awaited murder trial of Hasan, the Army psychiatrist accused of opening fire with a semi-automatic gun at Fort Hood nearly four years ago. (AP Photo/Brigitte Woosley)

  • Fort Hood Shooting

    Television cameramen walk by a Fort Hood Police Mobile Command Center near the Lawrence H. WIlliams Judicial Center as a pretrial hearing gets underway, Tuesday, July 9, 2013, in Fort Hood, Texas. Jury selection is set to start Tuesday in the long-awaited murder trial of Army psychiatrist Maj. Nidal Hasan, accused of opening fire with a semi-automatic gun at Fort Hood nearly four years ago. (AP Photo/Tony Gutierrez)

  • Nidal Hasan

    FILE - In this Dec. 18, 2012 courtroom sketch, U.S. Army Maj. Nidal Hasan, center foreground with back showing, is seen sitting between members of is defense team during a hearing in Fort Hood, Texas. The Army psychiatrist charged in the 2009 shooting rampage at Fort Hood is paralyzed from the waist down, after being shot by police that day. A judge has permitted him to represent himself at trial, but his compromised health means that his upcoming court martial will have shorter periods of testimony, more breaks and possible lengthy delays to write legal motions. (AP Photo/Brigitte Woosley, File)

  • Fort Hood Shooting

    FILE - In this Nov. 10, 2009, file photo, a memorial to victims of the Fort Hood shooting is shown before the start of a memorial service, to be attended by President Barack Obama, at Fort Hood, Texas. Osama bin Laden is dead and there hasn’t been a successful attack by al-Qaida-inspired extremists on U.S. soil since the deadly shooting rampage in Fort Hood, Texas, in 2009. But the danger of terrorism remains a reality for Americans, as seen in the attack in Libya in September that killed U.S. Ambassador Chris Stevens and three other Americans. (AP Photo/Donna McWilliam, File)