on the night of carolyn s murder, there had been a small party in one of the apartments. and now the detective was canvassing the complex. looking for leads. reporter: you re literally dock knocking on doors. yes. in one unit, two men answered. one of them had been to the party. his name was ynobe matthews he he mentioned that he did attend this party. she was there. like many people who d attended, ynobe agreed to an interview, his down at the police department. he was friendly, and cooperative said carolyn had left the party before he had. he later left the party. went with another female that was at the party over to a convenience store that was close by and bought some cigarettes. ynobe gave the detective a dna sample, and supplied the clothes he d been wearing. to verify his alibi, the detective pulled surveillance video from the convenience store and noticed something. the clothing that he was actually wearing was different than what he had just told us
in the investigation. it was probably within a week, i quit my job and left up to. i was scared. reporter: she now regrets that decision. her attack happened first. months before jamie was murdered. i feel like if i would have stayed and fought him through the police department that possibly he wouldn t have been able to go on to hurt anyone else. reporter: and kristin, is left with the memory of an assault, that, according to the law, never really happened. i was so angry that two people had to die in order for someone to believe me. reporter: did the system fail? it failed me. it failed carolyn. it failed jamie. reporter: you think about them a lot? they were total strangers to you. but they re my alternative future. i mean, they re what could ve happened to me. i mean, they re what could ve happened to any of us. reporter: a jury convicted ynobe matthews of carolyn s murder and sentenced him to