Cult leader and killer Charles Manson admitted to committing murders before he infamously became the head of the so-called Manson Family and led his troop of followers to commit a string of brutal killings in California in 1969. The revelation comes in the form of a chilling prison phone call recording, which was released in a teaser for the upcoming Peacock docuseries Making Manson. “There’s a whole part of my life that nobody knows about,” Manson, who died in 2017, says in the clip. “I lived in Mexico for a while. I went to Acapulco, stole some cars. Got involved in a couple killings. I just got involved in stuff over my head, man. Got involved in a couple of killings. I left my .357 Magnum in Mexico City, and I left some dead people on the beach.” Manson was convicted of first-degree murder for the deaths of seven people, including the actress Sharon Tate, although he did not commit the killings himself. Earlier in life, he was in and out of psychiatric institutions and prisons for crimes that included robbery and rape. The new series, directed by Billie Mintz, explores Manson’s life before he headed up the commune populated largely by young women.