Entertainment Tonight.

Two individuals close to the Carradine family told Larry King on Friday night that the family has sought the FBI's help in investigating the late actor's death in Bangkok, Thailand, and there are plans for a second autopsy. Read on for all the new details.

Mark Geragos, an attorney for David's actor brother Keith Carradine, told King that the Carradine family met with the FBI on Friday, in hopes that the agency can compel Thai officials to launch an investigation in Bangkok soon.

The Carradines want the FBI to be involved "at least in an assisting role, so that they can kind of oversee what's going on," Geragos said. He added that the FBI has to go through a series of legal channels and hurdles to get involved, but they "can be invited over there immediately. And I call on the people in Bangkok to invite them in."

Geragos said that Carradine's body is being brought back to the U.S. this weekend for a second autopsy, which he said could help shed light on whether foul play was involved in the "Kung Fu" star's death.

"I think there had to be foul play," Carradine's manager Chuck Binder added. "I mean my gut instinct is something definitely happened there."

When another King panel member mentioned that Carradine was reportedly interested in secret societies, Geragos said this reported interest was "connected to martial arts and [Carradine's] interest in martial arts. And so there is a suspicion that if there was some foul play, that that may be the first area where [investigators] should look."

Geragos and Binder both reiterated that the Carradine family doesn't believe that the 72-year-old was suicidal. Geragos said Carradine had spoken with his brother Keith within the last two weeks and seemed "not at all" depressed and was "very excited" at the prospect of returning home from shooting a movie in Thailand.

A police source told the Associated Press that Carradine was found hanged in his hotel room closet with a rope tied to his neck and genitals on Thursday.