John Norman Collins & The Michigan Murders

John Norman Collins was responsible for the "Michigan Murders"...Collins killed young women between 1967-69 in the Ann Arbor/Ypsilanti area of Southeastern Michigan. He targeted victims between the ages of thirteen and twenty-one, kidnapping, sexually assaulting and later killing them. It took three years before authorities finally caught up to Collins, catching him one week after his latest murder. What possessed Collins to commit these awful atrocities and how did he get away with the crimes for so long?