(Danvers, MA) -- Disturbing new details are surfacing in the murder of a young Massachusetts teacher. According to multiple reports, the teen accused of the killing on Tuesday may have used a box cutter in the attack. Philip Chism is being held without bond and will undergo a mental health evaluation. Police say he attacked Colleen Ritzer in a Danvers High School bathroom before dumping her body in some nearby woods. The "Boston Herald" reports Chism attended a showing of the new Woody Allen movie afterward.