The suspect in a shooting spree targeting pedestrians and vehicles throughout metropolitan Phoenix on Thursday is a teenage security guard who allegedly told police he believed people were after him in the wake of a separate shooting he was involved in while working at a restaurant last month, according to court documents.

Ashin Tricarico, 19, of Surprise, California, was charged Friday with first-degree murder, aggravated assault, drive-by shooting and endangerment in connection with the shootings, which left one person dead and a dozen others injured. There may be additional charges based on the investigation, police said.

He is being held on $1 million bond, according to jail records. Attorney information was not immediately available.