This is truly terrible.
Lee Manuel Viloria-Paulino (pictured above) had been missing since November 18 when a woman tragically discovered his mutilated body on Thursday.
The Lawrence, Massachusetts teen was found decapitated near the Merrimack River, and the Eagle Tribune reports his head was about 50 feet from his body.
Over the weekend, authorities arrested and charged the 16-year-old's classmate, Mathew Borges, for allegedly murdering and decapitating the student.
While cops don't yet have a motive, a police report obtained by the Boston Globe said Mathew had confessed to the crime to another witness, saying: