A secret sect of kung fu assassins could have silenced actor David Carradine as he delved into their shadowy activities, according to his family's lawyer.

In a twist that could be straight out of one the "Kill Bill" star's movies, attorney Mark Geragos suggested that Carradine may have been killed as he tried to uncover groups working in the martial-arts underworld.

The lawyer said the actor's family refuses to believe he died in a sadomasochistic sex stunt gone wrong — despite his being found naked with a rope tied around his neck, wrists and genitals.

Loved ones have urged the FBI to travel to Thailand and pick up the pieces of the police investigation there.

"They've done it because of the conflicting reports and the nature of those reports that have given the family great pause," Geragos said.

The secret societies of martial artists should be the first place they start looking for answers, said the prominent Hollywood lawyer, who has represented Michael Jackson, actress Winona Ryder, wife killer Scott Peterson and singer Chris Brown.

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