Danvers High School students hold candlelight vigil to mourn the death of 24-year-old math teacher Colleen Ritzer on Wednesday, Oct 23, 2013, in Danvers, Mass.

Danvers High School Reopens as More Details Unfold About a Math Teacher's Murder

Suspect Philip Chism may have used a box cutter to kill Colleen Ritzer in a girls' bathroom.

Danvers High School students hold candlelight vigil to mourn the death of 24-year-old math teacher Colleen Ritzer on Wednesday, Oct 23, 2013, in Danvers, Mass.
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Students at Danvers High School returned to class Friday morning amid new details regarding a 14-year-old student's alleged murder of a math teacher.

Students say Colleen Ritzer, whose body was found unconcealed in the woods behind the school, asked Philip Chism to stay after the final bell Tuesday to help him prepare for a test. One student told The Boston Globe she didn't think twice when she saw the two together in Rizter's classroom more than an hour after the last class of the day had ended.

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"She was standing at her computer, and he was just sitting there," said Cambria Cloutier. "It just looked normal, like any other day.

Sources close to the investigation told CNN that at some point, Chism followed Ritzer, 24, up to the girls' bathroom on the school's second floor where he allegedly killed her with a box cutter. A recycling bin found down in an embankment 100 feet away from the school may have been used to transport Ritzer's body, sources believe.

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After changing his clothes, Chism headed to a Wendy's restaurant and caught a movie before being spotted in a neighboring town on Wednesday, CNN reported.

Chism has been charged with first-degree murder and will be tried as an adult. He is being held without bail following an arraignment Wednesday in Salam, Mass.

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