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PLACENTIA, Calif. (AP) — Authorities say the Southern California teacher who committed suicide by hanging in her classroom was a well-liked 31-year-old photography instructor.

Placentia police Lt. Eric Point says Jillian Jacobson, of Anaheim, was found in full cardiac arrest Monday morning.

Several students at El Dorado High School found the classroom door locked and thought Jacobson was late. Point says they went next door to get another teacher, who returned with them and opened the door. Jacobson was found hanging from the ceiling.

Paramedics performed CPR but she was pronounced dead.

Assistant Superintendent Kevin Lee, with Placentia-Yorba Linda Unified School District, says classes were dismissed for the day at 11 a.m.

Crisis counselors are available on campus.