A 16-year-old girl was fatally stabbed at a high school in Milford, Connecticut on Friday morning, reportedly over a prom date dispute.

Maren Sanchez, a junior at Jonathan Law High School, was attacked by a 16-year-old male student in the hallway around 7:14 a.m. ET. Authorities confirm she was pronounced dead at Bridgeport Hospital about half an hour after the attack, despite attempts by teachers and emergency responders to save her.

The suspect, who has not been named because he is a minor, has been taken in to police custody.

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The school was put on lockdown Friday morning and students were sent home after the stabbing. A former faculty member from the school told FoxNews.com that the suspect was arrested.

Police said that the attack was an isolated incident and no other students were in danger. The school's prom,  scheduled for Friday night, was postponed to an as-yet undetermined date, a school official said.

Sanchez was an honor student and swim team manager who was heavily involved with community service, particularly causes like underage drinking and veterans' services, school officials said.

A junior at the school told FoxNews.com that a teacher who witnessed the attack said Sanchez was asked to the prom by the attacker inside a stairwell at the school. Sanchez, who has a boyfriend, said no to the date, and the suspect began to strangle her, the student said. He pushed her down a flight of stairs and stabbed her.

Two male teachers eventually took the suspect to the principal's office until police arrived. The student said she saw the suspect being handcuffed and he "looked angry."