I remember watching the documentaries about him in the 90's. As I understand it, there was scant technical evidence against him but he produced some very detailed and convincing confessions of his murders. One which he retold in an interview was him sneaking up on a camping German couple sleeping in a tent and stabbing them both to death while they were still trapped inside. He also told stories about his step father taking him on "hunting trips" in the woods in which he forced Quick to perform oral sex on him. Those stories were also found out to be lies but were also incredibly believable.