Danvers Police
Chism was indicted on charges of first-degree
He allegedly stole 24-year-old Ritzer's credit cards after murdering her and used one of the cards at Wendy's.
Chism's peers at Danvers High School told the Globe that Ritzer had seen drawing in class, and that she asked him to stay after school to prepare for a test.
One student said she saw Chism in Ritzer's classroom more than an hour after class ended. He was sitting as Ritzer stood at her computer, the student said.
Chism allegedly attacked Ritzer in a school bathroom and stuffed Ritzer's body into a recycling bin before dragging her into the woods near the school.
He pleaded not guilty to the murder charge.