Charles Manson might have been responsible for a number of previously-unaccounted-for murders, according to officials seeking access to an audiotape containing an interview between Manson Family member Charles "Tex" Watson and his late attorney, Bill Boyd.

Boyd, who died in 2009, said his client Watson told him that the infamous cult leader was responsible for more deaths than the law had caught onto.

"I was impressed, he was extremely candid and told me about a bunch of other people Manson had killed," Boyd said of Watson in an interview with an author writing about Manson.

Boyd said Watson did not implicate himself in the killings in the recorded interviews, which span more than 20 hours. Los Angeles police are seeking to retrieve the tapes as evidence out of a Texas bankruptcy court, Fox reported.