reporter: now her friend was dead, and the father of both their sons was sitting in the police station answering questions. when was the last time you were actually at the house? i i couldn t even tell you for sure. it s probably been three months. so when did you actually last see jessyka? when she dropped my son off last night. reporter: which meant john was the last known person to see jessyka alive except for the killer. unless he was the killer. detectives brought in jessyka s family members and friends and questioned them all about john. i think everybody kind of had their own impression of jonathan. reporter: and some of those impressions were not flattering. she would post pictures when she was out with friends, and if she s around another guy, even though they re just friends, john you could tell like he was a little like, who s that? why are you with him? jealous type of thing? yeah. did jessyka trust john? no. no.