>> at her desk in colorado, shannon jensen was asking questions of her own with a computer screen ins. and she had tracked down a promising lead. she spoke with someone whose dna profile was close enough to that of the killer, that they were likely cousins. that cousin told jensen about two men who had been estranged from her family for years. >> there were two brothers and essentially i had to look at both of them. >> and as she started digging something stood out about one of the brothers. >> out comes the criminal history for curtis allen white. >> he was convicted of rape in the late 70s. >> he served times for right before he was parole to dulles county. >> douglass county colorado where healing key was murdered. it all fit. he was how older at that point? >> 21 when he was paroled here. >> same age as helene. >> yes. >> it was time to tell the tenant then boss of the cold case unit. >> i come around the corner i see her and she says i know who did it, i said did what? she says i know who the killer is for helene, and i'm like no you don't. >> he knew all about the investigative