The family of David Carradine has called upon the FBI to further investigate the mysterious death of the Oscar-nominated actor.

Mark Garagos, an attorney for Carradine's brother Keith, appeared on CNN's Larry King Live Friday to speak on behalf of the star's family, who is distraught over reports David took his own life.

Citing unidentified police sources, local Bankok, Thailand newspaper The Nation reported that the actor, 72, was found hanged in his luxury hotel room in the Thai capital Thursday and is believed to have committed suicide.

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The Carridines -- along with the actor's co-manager, Tiffany Smith -- are refuting those reports.

"The cause of death is still under investigation in Bangkok," Smith told Us Thursday. "All I can tell you is that David did not commit suicide. I can tell you that 100 percent. He would never commit suicide."

Garagos told King the family is desperate for answers.

"They want an investigation," Geragos said. "I would think that the people in Bangkok would want to support an investigation and allow the FBI to go over there and assist in the investigation so we can get the answers to the questions."

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Thai police told the Associated Press they have not been contacted by the FBI.

The results of an autopsy performed Friday in Bankok are not expected for three weeks, Dr. Nanthana Sirisap, director of Chulalongkorn Hospital's Autopsy Center, told the AP. Carradine's body was flown from Bankok to Los Angeles early Saturday, an unnamed airport official revealed, though the report remains unconfirmed by the U.S. Embassy.