and she pulled up a picture of the check and it said, "to isaiah hagan for groceries.” 0. >> reporter: halee being halee, she told friends she'd forgiven isaiah after he promised to pay her back. >> if you want to take a seat over there. >> sure. >> reporter: three days after halee's death, police decided it was time to talk to isaiah themselves. >> he sat there in this chair and i sat here. >> what was his demeanor like? this is a -- this is a big case. this is a young guy. >> almost surprisingly calm. just very, very quiet. and didn't show much emotion at all. >> reporter: isaiah told investigators the same story he'd told jake. he'd picked halee up at her apartment and then dropped her off at that local park. >> and she's, like, "you can go if you want to," and i was, like, "are you sure? like, is everything okay. she's said, yeah, everything's fine. >> reporter: what isaiah didn't know was that more than a dozen investigators were watching his interview remotely from the next room. and they had proof he was lying. they'd checked the park's security cameras and there