CANCUN, Mexico -- Mexican authorities have arrested a former university professor who was on the FBI's Ten Most Wanted Fugitives list in the resort city of Playa del Carmen.

Prosecutor Gaspar Armando Garcia Torres said Walter Lee Williams, 64, is wanted on charges of sexual exploitation of children and traveling abroad for the purpose of engaging in sexual acts with children.

Garcia said Williams was captured late Tuesday while drinking coffee near a park in the Caribbean beach town.

"This person is wanted by the FBI because he is linked to the sexual exploitation of children," Garcia told reporters.

He said it wasn't clear how long Williams had been living in Playa del Carmen and that the fugitive also had an address in nearby Cancun, where he was taken and turned over to Mexican immigration officials.

Garcia did not say whether Williams is suspected of committing any crimes in Mexico.

A federal arrest warrant was issued for the former Palm Springs, California, resident in Los Angeles in April, according to the FBI website.

The indictment alleges Williams traveled from Los Angeles to the Philippines in January 2011 to engage in sex acts with two 14-year-old boys he met online in 2010, the U.S. Department of Justice said in a statement Monday.

While in the Philippines, Williams allegedly engaged in sex acts with both boys and produced sexually explicit photos of one of the boys. Williams fled the Los Angeles area approximately one week after returning from the Philippines, it added.

Until 2011, Williams was a tenured professor at the University of Southern California where his field of study was gender development. Williams was also affiliated with the Buddhist Universal Association of Los Angeles, California, according to the FBI.

"Williams has an extensive history of travel throughout the South East Asia region, specifically the Philippines," the FBI said. "He has reportedly resided in Indonesia, Polynesia and Thailand."

The FBI added Williams to its Ten Most Wanted Fugitives list on Monday.

"I analyzed the computers and the camera that belong to Williams and found child pornography," said Special Agent Jeff Yesensky, in a video about Williams posted on the FBI's website Monday to bring attention to the case.

"He preys on the most vulnerable children," Yesensky added.

Also on HuffPost:

Loading Slideshow...
  • Walter Lee Williams

    Walter Lee Williams, a former professor at the University of Southern California, was wanted for the alleged sexual exploitation of children and traveling abroad for the purpose of engaging in illicit sexual acts with children. Williams was captured June 18, 2013 in the Mexican resort town of Playa del Carmen.

  • Jose Manuel Garcia Guevara

    Jose Manuel Garcia Guevara allegedly murdered a 26-year-old woman in the presence of her four-year-old stepson in Lake Charles, Louisiana, in 2008. Guevara and the victim lived in the same mobile home park. Guevara allegedly broke into the victim's home, raped her, and brutally stabbed her to death. Guevara is believed to be in Mexico, but may have traveled to the United States using fraudulent documentation.

  • Fidel Urbina

    Fidel Urbina, 37, is wanted for the 1999 sexual assault and murder of one woman in Chicago and the 1998 sexual assault and beating of another. There have been reported sightings of him in Mexico.

  • Jason Derek Brown

    Jason Derek Brown is wanted for murder and armed robbery in Phoenix, Arizona. During November of 2004, Brown allegedly shot and killed an armored car guard outside a movie theater and then fled with the money. Brown speaks fluent French and has a Masters Degree in International Business. He is an avid golfer, snowboarder, skier, and dirt biker. Brown enjoys being the center of attention and has been known to frequent nightclubs where he enjoys showing off his high-priced vehicles, boats, and other toys. He has been described as possibly having bisexual tendencies.

  • Glen Stewart Godwin

    Glen Stewart Godwin escaped from California's Folsom State Prison in 1987, where he was serving a lengthy sentence for murder. Godwin allegedly murdered a fellow inmate in a Mexican prison, where he was serving time for a drug trafficking conviction.

  • Robert William Fisher

    Robert William Fisher is wanted for allegedly killing his wife and two young children and then blowing up their home in Scottsdale, Arizona in April 2001.

  • Semion Mogilevich

    Semion Mogilevich allegedly participated in a multi-million dollar scheme to defraud thousands of investors between 1993 and 1998. After the scheme collapses in 1998, and thousands of investors lost more than $150 million, Mogilevich -- who allegedly funded and authorized the con -- was indicted in April 2003.

  • Eduardo Ravelo

    Eduardo Ravelo was indicted in Texas in 2008 for involvement in racketeering, conspiracy to launder monetary instruments, and conspiracy to possess heroin, cocaine and marijuana with the intention to distribute. His alleged criminal activities began in 2003.

  • Alexis Flores

    Alexis Flores was allegedly involved in the kidnapping and murder of a 5-year-old girl in Philadelphia. The girl was reported missing in July of 2000 and found strangled to death in a nearby apartment in August of 2000.

  • Victor Manuel Gerena

    Victor Manuel Gerena is wanted for his alleged connection to an armed robbery of approximately $7 million from a security company in Connecticut in 1983. He allegedly held two security employees at gunpoint, then handcuffed, bound and injected them with an unknown substance to further disable them.