. >> reporter: enrique arochi was a guy christina had known in school. ne 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 together, but we went separate ways." and i said, "you telling me you did not see her get into her car?" and he said, "no." and i told him, i said "well, no one has heard from her. i cannot find her. we're about to call the police." >> reporter: mark couldn't dial fast enough. >> communications, how may i help you? >> i'm trying to report a missing person, uh, my daughter. she hasn't shown up from work. i'm just finding out about this. everybody's freaking out. >> does she own a vehicle? >> yes. a 2001 toyota celica. silver. >> reporter: about 30 minutes later, mark go