. >> that's what happened to marie gagliano as she unloaded groceries from her car. >> he had a snarly look on his face. he threw me down. he grabbed me by my ankles and he started dragging me. he dragged me about 15 or 20 feet. i was screaming, i mean, blood-curdling screams. he ripped my slip off and he started running. >> after that assault, police found hundreds of pieces of women's underwear in his home. >> this is a dangerous guy. he's knocking women down, he's dragging them into bushes, he's stealing their clothes, he's breaking into their houses. this is someone who's pretty much out of control. >> gorton served some prison time for these assaults in florida before moving back to michigan. since both murder victims had been sexually assaulted and investigators had dna of the killer, they wanted to know whether it was gorton's dna. so they put gorton under a 24-hour surveillance. they followed him to a local roller skating rink where he took his children. undercover officers watched gorton eat pizza and drink soda from a styrofoam cup. when gorton left, an officer rushed to the