-- just blown over and i'm overwhelmed and i could hear the emotions in her voice. and -- and she says, "yeah, we've got a match. " and said, "this is how it happened. " and i'm goin'-- >> wow. >> "just like on tv, huh? " [laughter] and goes, "yeah, it does happen. " >> diane then called brittani, who was in boston with sister, jennifer. >> i said jodi called, and she's got a match. >> she's like, "they know who the guy is. " i'm like, "what? " she goes, "it's a dna match 100%. " i'm like, "who is it? " she goes, "justin hansen who you ga -- you remember giving that tip to her? " i'm like, "yeah. " she says, "it's 100% match. " i'm like, "well, holy crap. " i was like, "my prayers were answered. " so i called jodi. and i'm like, "you have no idea how thankful i am for -- for you solving this, jodi. " she goes, "no. you did it. " i said, "no, you did. " she goes, "you have me the name. " i was all, "but you acted on it. " >> hansen was arrested while out shopping. for the marcell sisters, it was hard believe the monster who'd haunted them