she s starting to lose jobs. it s like all hell broke loose in her head. reporter: but murder? remember, the police went to see dawn just a couple of hours after ben was killed, found her fast asleep. what time did you think you went to sleep? oh, god. i watched the movie the depart departed and i don t know, about 4:00. in fact, she happened to be sharing her bedroom with a 21-year-old family friend named james matlian. we watched a movie and went to bed. yeah, that s her story. that s it. reporter: not exactly a convincing alibi. any more than the obvious fiction that james, the new man in her life, was just a friend. even less convincing, when detective ron elgis learned about a trip to a 7-eleven store, middle of the night, about an hour and a half before the murder. why are they hiding little pieces that s seem insignificant to what is going on? then we started to do surveillance on them. now they re starting to get