[overlapping speech] andrea canning (voiceover): reagan tokes' friends >>> reagan tokes' friends were living a nightmare. a day earlier she was the beating heart of the group and now she was dead. ripped from their lives in such a violent way. >> i don't think any of us left at all. we stayed together the whole night. we had a lot of people, i think all of our parents came to our apartment and were there to console us. it didn't feel real at all. >> reporter: trying to figure out who killed her was equally confusing. because it couldn't be her ex- boyfriend, her disappearance hit him hard. >> i remember talking to jake that day. you could tell that he was very worried. >> reporter: detectives checked jake's alibi and it was rock solid. >> he tells us he was watching a movie with his roommates and we were able to interview the other roommate epperly and they all backed up his story completely. >> reporter: did you literally cross them off for this? >> we cross them off the list. >> reporter: truth be told, their list had no promising names on it. they traced reagan steps that last day.