>> the last person known to see cassie alive was her boyfriend, matt beckham. he claims he had stopped by to keep cassie company as she house-sat but then he left around 9:30. >> matt is very adamant that when he left cassie alone that she was fine. they hadn't been arguing. they hadn't been fighting in any manner. but everybody is still a suspect or a person of interest until we can 100% clear them. but matt beckham passes a lie detector test. he's cleared as a suspect, and instead he becomes a witness, and he tells police that he wasn't the only one at the house the night cassie was killed. >> when we interviewed matt, we learned of two other people that he had been there to visit that night. >> she's our friend. but you know what? we all have to make sacrifices. our first victim is going to be cassie stoddart. she's going to be alone in a big dark house out in the middle of nowhere. how perfect can you get? >> i'm horny just thinking about it. >> hell, yeah. >> one was torey adamcik and the other one was brian draper. >> coming up, investigators have two new