SALEM, Mass. -- (WGN) -- Surveillance video shows Philip Chism, a former Massachusetts high school student accused of raping and killing his algebra teacher, following the woman moments before her slaying.
The video shows Colleen Ritzer walking down a hallway at Danvers High School. Seconds behind her wearing a hoodie is Chism, according to prosecutors.
The video cuts to a shot of Ritzer walking into the bathroom. Chism, a few steps behind, pauses at the door and puts on gloves before walking in behind her.
Prosecutors say Chism raped and murdered Ritzer in a school bathroom. Then, he used a recycling bin used to move Ritzer's body to the woods outside of the school.
Chism has pleaded not guilty in the October 2013 slaying. He was 14 at the time.