they needed to speak with dooley again, so they went to the apartment he shared with his wife, janet ey wasn't surprised to see them. >> a kind of figured it would happen, to do a follow-up. >> before detective mcvay even brought up, dooley told him he'd gone home the morning of the murder. mcvay recorded their conversation. >> i came back here, and then went back to fisher. >> you came back here? >> i can back here, yeah. i couldn't get a hold of my life, and i came home to make sure she was okay. >> yesterday you didn't tell me you left. why, you are just -- >> i didn't think about that. >> the detective also question david's wife janet separately, to see if she would tell the same story. this conversation would prove critical to the entire case. what she said is in dispute because a part of the recording is hard to hear. >> once the first time you saw dave after he left... >> was the first time i see him yesterday? >> yes. >> when you came, after he was -- >> yes, yeah. >> i ask her specifically if david ever came home that morning, and she says no. >> two stahl and mcvay, janet do