According to ABC News and Boston's Fox 25, Chism told police that he followed Ritzer into the woman's restroom, punched her in the face, slashed her throat with a box cutter and put her body into a recycling bin, which he then dragged into woods near the school.
As for what Chism was doing in the hours between the crime and his arrest, the teenager was reportedly taking in Blue Jasmine, the new Woody Allen movie, at a nearby movie theater, according to ABC News.
Chism was arraigned on a murder charge yesterday afternoon and is being held without bail. He will be charged as an adult. Police still haven't released a motive for the crime or any information about the relationship between Chism and Ritzer.
[Image via AP]