quisenberry the family friend who made the last phone call to earon and kenneth williams who admitteda witness he was part of a robbery that turned deadly. now, it was time to bring both men in and interrogate them. >> i was a little apprehensive. no nervous. no butterflies. just because it was something i planned on and prepared for for such a long time. >> you were ready. >> i was ready. >> 15 months after the shooting quisenberry and williams voluntarily came down to headquarters. each knew the other was there. >> i wanted to understand if they didn't tell us the truth, the other guy may be. >> as a tactic, even walked williams past a closed circuit monitor where he could see quisenberry in the interrogation room. he's got time to think, hey, what's he telling them. >> they needed both to admit they were in the house when shootings went down. back up murder charges against both of them no matter who pulled the trigger. quisenberry was interviewed first. said he knew nothing about the crime. as the interrogation wore on, he started blaming the man in the other room. >> i wasn't ther