talk to our switch squad at your local xfinity store today. >> even now, decades later, kurt thomas remembershool, principal showing up in his classroom and looking straight at him. trouble. >> the principal turned and said, mr. thomas, we need to talk to you. okay. and i get up and when i walk there he said, i need you to go out in the hallway and talk to these gentlemen. >> these gentlemen were the two detectives forced the sign to the case. kerr says he didn't know why they'd wanted to talk to him, because he hadn't heard about the murder yet. soon, he was inside an interrogation room, answering questions about the previous day. >> go through the night, kurt. what time did you get a school? did you drive from schools? you know? >> they want to timeline. >> very factual. >> he says after hours of back and forth, the detectives finally told him michel had been murdered. the unhappy fact was you were the last person in her circle of associates not seen her life. >> that realization hit me like a brick. that's >> not a good place to be in. >> oh, no. at that point, i was somewhere in shock. >>