Sammy Anthony Terrazas Jr. likely will spend his 18th birthday Friday behind bars.

He was arrested Tuesday at Pueblo Magnet High School, where he is a student, and booked into the Pima County jail on suspicion of first-degree murder in the shooting death of Jesus Duarte, 19. He is being held on a $1 million bond, said Deputy Tom Peine, spokesman for the Pima County Sheriff's Department.

Detectives went to the school, at 3500 S. 12th Ave., at about 11:45 p.m. Tuesday to speak with a female student they believed was in a "romantic relationship with the victim," according to a Pima County Justice Court document. While interviewing the girl, detectives found out she was dating Terrazas, who was at school that day.

"She also said that Sammy had a gun in the glove compartment of his Dodge Durango," the court report stated.

However, before detectives could detain Terrazas, he "left the classroom he was in and began running away," according to the court document.

Terrazas was in his vehicle in the school parking lot when detectives spotted him. He tried to drive away, then got out of the Durango and ran, Peine said.

Terrazas did not have a gun on him when he was arrested, Peine said.

The teen is suspected of luring Duarte out of his apartment in the 6400 block of South Camino de la Tierra, north of West Valencia Road, just before midnight Sunday and shooting the victim multiple times as he pleaded for his life, Peine said.