The Babysitter & The Cyber Killer

S5, E2: 19 year old babysitter Katy Briscoe was stabbed 23 times and killed. Although, there were no immediate suspects, it was clear that Katy knew her killer and had willingly let them into the house. Detectives discovered that during the six months leading up to her brutal murder, Katy had been lured into a twisted virtual world, where no one was what they seemed and no one could be trusted.