More than 20 years later, Lake Headley co-wrote a book with freelance writer William Hoffman: Vegas P.I.: The Life and Times of America's Greatest Detective (1993). In it he presented well-documented evidence that Donald DeFreeze was a police informant and agent provocateur from the period when he was organizing the SLA."Vegas P.I.: The Life and Times of America's Greatest Detective, Thunder's Mouth, 1993
