Investigators gathered evidence in the woods behind Danvers High School, where the body of slain math teacher, Colleen Ritzer, was found.

Ritzer, 24, was "a very, very, respected, loved teacher. ... It’s a terrible tragedy for the entire Danvers community,” Essex District Attorney Jonathan Blodgett said.

Philip Chism, 14, was arraigned at Salem District Court, where he was charged in Ritzer's death. Chism was charged as an adult, pled not guilty, and was held without bail.

Murder suspect Philip Chism had been reported missing Tuesday after he didn't return home from school. Chism was found by Topsfield police at 12:30 a.m. Wednesday walking north on the southbound side of Route 1.

State and local police outside the high school, which was shut down due to the homicide investigation.

Pink ribbons were placed on trees in remembrance of Ritzer.

Flowers were delivered to the Andover home where Ritzer lived with her family.

Dianna Chism (center), the mother of accused killer Philip Chism, left a courthouse after Chism's arraignment.

Flowers and teddy bears were left outside Danvers High School.

Christian Snyder, 14, paid his respects outside the school.

Investigators gathered evidence in the woods behind Danvers High School, where the body of 24-year-old teacher Colleen Ritzer was found.

Police said evidence was found at “multiple scenes at the Danvers High School and surrounding wooded area.”

Danvers student Christian Veatch paused after leaving flowers and a teddy bear outside the high school.

A police officer guarded the entrance to Danvers High School. Classes were canceled at all Danvers schools for the day.

A police officer guarded the entrance to the high school.

Essex District Attorney Jonathan Blodgett spoke at a press conference at Danvers High School.

An officer outside the high school office. Police have a 14-year-old boy in custody after a high school teacher, 24, was found in the woods.

Investigators entered the woods behind the high school early Wednesday.