210: Dateline "Scorned"

The text messages came often and always went something like this: "My favorite thing to do is stand outside and stare at you," or "I hate you so much, I want to drive a knife into your heart." The texts were sent to Dave and to his ex-girlfriend Liz. The texts came from Kari, who was stalking them both, but who nobody had physically seen in over a year. It was a love triangle, that could only end one way: Murder.