New details from the case of Philip Chism- the teen who confessed to killing, and now raping, his high school math teacher. Colleen Ritz was found in the woods behind Danvers high school after a brutal assault, which involved a tree branch, followed by her murder, done with a box cutter. The 14 year-old suspect will be charged as an adult for the homicide and as a youthful offender for the sexual assault.