Math teacher Colleen Ritzer was murdered by her 9th grade student Philip Chism, after he followed her to the bathroom, attacked her with a box cutter and SA’d her. He dumped her body behind the school in a bin. #fyp #colleenritzer #philipchism #crimetiktok #harrowing #crimetok #truecrime #scary #shocking #captive #cctv #bodycam