A 33-year-old woman called "Karen" says there is a man out there who wants to kill her. "I still to this day wonder ,"Why me?'," she says. "The only way I will ever get my life back is if he's in jail." Over the last year and a half, she's told police that he's already viciously attacked her – not once, but three times. What's scariest for Karen is that he's a stranger - she has no idea who he is or whether he'll be back. The case has Karen terrified, and the police in two Oregon towns absolutely baffled. "In my 12 years experience, I've had nothing like this before," says Det. Larry Braaksma, with the Tualatin Police Department. With no witnesses to any of the attacks, police are left with little more than the bizarre details provided by Karen, the stalker's only known victim. And they're getting worried, because each attack seems to be more violent than the last. Correspondent Erin Moriarty reports.