Based on the flashback of the murder at the end of the episode, the killer would have left fingerprints on the murder weapon so the case could have simply been solved by forensic evidence.
Red-haired actress: Leslie Hope.
With the new large TV screens it's easy to see what appears to be a piece of thread hanging down below one of the lenses at the beginning of the episode (right after the opening theme) while Jane talks to Kristina.