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The family of late actor David Carradine is urging the FBI to investigate into the circumstances surrounding his death.

His co-manager, Tiffany Smith, told Us Weekly, “The cause of death is still under investigation in Bangkok. All I can tell you is that David did not commit suicide. I can tell you that 100 percent. He would never commit suicide.”

While investigators work to figure out how Carradine met his demise hanging from his hotel closet with a rope tied around his genitals, The Smoking Gun has obtained divorce court documents filed by his ex-wife Marina Anderson.

In the filing, Anderson accused her ex-husband of “deviant sexual behavior which was potentially deadly” and alleged that he was involved in an “incestuous relationship with a very close family member.”

Yikes.

Gallery Info: David Carradine and his widow Annie Bierman.