John Norman Collins

Serial killer John Norman Collins used to pick up young women on his motorcycle in the Ypsilanti area of Southeastern Michigan. They were then abducted, raped, beaten and murdered by him, typically by stabbing or strangulation. He then discarded their bodies here and there, but they were always washed. It turns out he only killed women who were on their period. It is theorized that this may have been a factor in the sexual violence exhibited upon the victims.