its her husband is the killer
I thought he was the killer in the 1st episode too because at the beginning of the episode she was calling him asking where he was at when she got the call to go to the crime scene but the ending kinda threw me off with the forensic guy
He was just a smoke screen though,her husband is the killer
Notice how in this episode she asks why did the kids call her and he says he was out with his budy
So he was nowhere to found when the girl was tied up in the burning house and he conveniently goes missing again when the body parts got dumped in the lake