Dorothy Dutiel and May Kieu

Anti-gay demonstrators staked out the Arizona high school where a lesbian couple died in a murder-suicide on Friday.

Classmates of the deceased 15-year-old sophomores were met by anti-gay protesters on their first day back Tuesday.

Dorothy Dutiel allegedly shot and killed her lover May Kieu before she could break up with her. She then turned the gun on herself. The murder-suicide occurred outside the school cafeteria before 8 a.m. Friday.

At least 2 anti-gay protesters with megaphones stood outside Independence High School as grieving students returned to classes on Tuesday.

The school’s principal sent letters home to parents denouncing the demonstration.

“We want you to know the opinions the protesters expressed were hurtful and offensive to many students who were grieving the loss of their classmates,” Principal Rob Ambrose wrote.

The U.S. Constitution gives citizens the right to protest and peaceful assembly.

The day before the shootings, a male classmate reportedly loaned Dutiel his parents’ handgun without permission. She told him she needed the gun for protection and she would return it to him on Friday.

The boy is cooperating with investigators.