Something seems odd to me about Mollie’s boyfriend. Can’t quite put my finger on it.
Can you re-post the photo that is giving you the heebie-jeebies?
He was supposedly out of town when she disappeared. If his story checks out, which the police can easily do with location data and witnesses, then you should not try to pin a horrendous crime on this fellow. If his story didn’t pan out, the police would be all over him.