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Was enrique. >> and i'm like, "who's enrique?" >> yeah, because we didn't know enrique. >> reporter: enrique arochi was a guy christina had known in school. he was the one who left the party at the same time and had offered to walk with her. >> how well did you know enrique? >> i graduated high school with him but i wasn't -- i was acquaintances with him. i didn't really ever talk to him. >> and that was pretty much christina's relationship with him, too, right? >> yeah. >> reporter: steven chased down enrique's number from other friends, and anna called him. >> he told me "we did leave togeth...

The ambition or the money, relying on christina to help him with his business and with the bills. >> she worked a full-time job and was a manager. her boyfriend didn't do anything. she supported him. >> reporter: so she had a mom and a dad who worked, correct? >> uh-huh. >> right. >> reporter: where did she get this idea that it's, like, okay to be with a guy who didn't do anything? >> well, because that's our world, not her world. >> reporter: okay. >> i -- i know, i'm the same way. trust me. it bugged the heck out of me. >> reporter: on the friday of labor day weekend, hunter decided to driv...

Mom, jonni, now living up in tulsa, oklahoma, got a text from one of christina's friends. >> asking me have i heard from christina. and i said, "no. why?" and she sent me back a message. she goes, "her boss called me and said she never showed up for work." >> reporter: she hadn't shown for her shiftsn satuay or tuesday. >> i immediately got a feeling in my stomach that i've never had before. i knew something was wrong. i sent christina a message on her phone. and i sent hunter a message. >> reporter: hunter, christina's live-in boyfriend. >> and he never called me back. >> reporter: jonni call...

Police obtained a search warrant, and brought the car down to the crime lab garage. and they showed that gas station video to the csi techs. >> and one of the c.s.i. investigators thought to herself -- >> where is a likely place that would have d.n.a., that's hard to clean, and she said that her gut told her to swab the weather stripping, the rubber portion of the trunk at the seal. >> reporter: it's that black rubber gasket that lines the opening of the trunk. >> they swab it, and send it off to the laboratory for confirmatory tests. >> reporter: as you can imagine, detectives weren't saying ...

Gets hold of hunter and says, have you seen christina and he said, no, i haven't since friday. >> right, he figured she was with us or with her mom. >> reporter: hunter who is living with her doesn't say anything, doesn't call you, doesn't sound the alarm, doesn't call anybody? >> don't get me started. >> mark and anna continued to work the phones, eventually reaching christina's pal, steven nickerson. >> her dad asked me if i had seen christina or heard from christina, and i said no, and the last time i talked to her, you know, was saturday morning. he asked me like who did she leave with. i ...