Authorities in the quiet Massachusetts town of Danvers were trying to determine why a beloved young math teacher was killed at the school where she taught.
A judge on Wednesday ordered Philip Chism, 14, held a murder charge. The body of Colleen Ritzer, 24, was found in woods near Danvers High School, authorities said.
NBC is reporting Chism just recently moved to Massachusetts from Clarksville, Tennessee.
Essex District Attorney Jonathan Blodgett said a search began for Ritzer, of Andover, on Tuesday after police were notified that she had not returned home from work and was not answering her cellphone.
Investigators found blood in a school bathroom and soon located her body. Blodgett said the teen, who transferred to Danvers this school year, stabbed Ritzer and then dumped her body in the woods behind the campus.
Chism, a member of the junior varsity soccer team, also was reported missing Tuesday after failing to return home from school, Blogdett said. He was found early Wednesday.
"This is a terrible tragedy for Colleen Ritzer and for the entire Danvers community," Blodgett said.
Blodgett said Ritzer was "a very respected, loved teacher." She often used Twitter to stay in touch with her students, last tweeting geometry homework links two days ago .
Her Twitter profile: "Math teacher often too excited about the topics I'm teaching."
She often tweeted encouragement to her students, such as "Good luck to sophs/juniors on PSATs tomorrow :) I hope there's a proof on there...that would be so much more fun!"
She had a few hundred Twitter followers, with whom she also shared personal shreds of her life -- usually punctuated with exclamation points. "Attempting to make my first apple crisp!" was a recent one; "Lots of Full House episodes on Nick tonight!!" was another.
A more serious tweet in a time of tragedy: "This world is a crazy place. Love who you love and live every day. Thoughts and prayers to those affected at the Boston Marathon."
Mary Duffy, who lives next door to the Ritzer family in Danvers, told the Boston Herald she knew Colleen for almost her entire life.
"If every family had a daughter like Colleen Ritzer, it would be a wonderful world," Duffy said. "She always wanted to teach math.
"She was a quiet, pleasant girl with many friends. She was just like the ideal daughter. She is. This family is a family of America, They are the ideal family, they are friendly, they are loving, close."
Danvers police were at the school most of the night. Town officials called parents at about 4:45 a.m. Wednesday, saying only that there was a police presence at the school and classes were canceled, boston.com reported.
Danvers police had tweeted Tuesday: "Missing Child Philip Chism 14YOM was last seen today at 6:30 near Hollywood Hits." Hours later, police tweeted: "Philip chism has been found safely."
Sitting in a car parked across from the school, two students told boston.com they were stunned and terrified to hear what had happened
"We are all terrified. It's very scary," said Caitlin McBride, a junior. "No one will ever look at this school the same way anymore."
McBride said she received a text this morning saying the school was closed.
"I didn't know what to do," Kendall Meehan told the website. "It's all very scary. It's not something you see around here."
Contributing: Associated Press