and to the lieutenant's surprise, it was a name he knew -- brian lee golsby. he'd put him behind bars for attempted rape and robbery six years earlier. >> wow. are you just floored by this news? >> i am. i am so floored by this, 'cause i thought he was still in jail. i was shocked. >> reporter: lt. davidson learned that golsby was released three months before reagan's murder and was living in a house less than half a mile from where her car was found. he sent a s.w.a.t. team to make the arrest and bring him in. >> brian, you're not here by accident. all right? we didn't just happen to stumble upon this and now you're here. you're here because we have a pretty good amount of evidence on what happened. >> reporter: detective forney was the lead interrogator. >> he wanted to know what we had on him, and that's all the information he was gonna provide to us on what we already knew. >> reporter: investigators had golsby's dna inside reagan's car. he quickly copped to robbing her. >> so you got in the car, right? and you went to chase. >> did you drive or she drive?