New York - Former Kung Fu star David Carradine may have been killed for his investigation into secret martial arts societies, his family's lawyer has hinted.

Mark Geragos said on Larry King's talk show last Friday that Carradine was investigating the secret societies, whose members had the motive and means to kill him, the New York Post reported on Sunday.

A panel member had said on the show: 'David was very interested in investigating and disclosing secret societies.'

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