26-year-old Omero Mendez was sitting in his car parked on the Lakota Middle School campus to wait to pick up his girlfriend's son. There, he was confronted by 16-year-old Luis F. Cosgaya-Alvarez and two of his friends who were inside an SUV. Cosgaya-Alvarez flashed gang signs at Mendez, and then shot Mendez once in the head. Mendez later died of his injuries. Cosgaya-Alvarez was arrested a few days later in Seattle and was charged with murder.