A Massachusetts teenager was convicted Tuesday of killing and beheading his classmate because of jealousy over a girl.

Mathew Borges, 18, of Lawrence, Mass., a Boston suburb, was found guilty of first-degree murder in the 2016 death of Lee Manuel Villoria-Paulino, 16, according to USA Today. Borges was 15 at the time of the incident but was tried as an adult.

The teen will be sentenced July 9 and faces a maximum penalty of life in prison with the possibility of parole in 30 years.

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“Nothing can bring Lee Paulino back to his family, who obviously love and miss him very much," Essex District Attorney Jonathan Blodgett said in a statement to the newspaper. "It is my hope that this verdict gives them some comfort and peace."

Prosecutors said that Borges was jealous that Villoria-Paulino hung out with a girl at their school. They accused Borges of stabbing his classmate then cutting off his head and hands. The victim's body was found by a woman who was walking her dog along the Merrimack River.

Borges could be seen on surveillance footage heading toward the river on the day Villoria-Paulino went missing, The Boston Globe reported.