A Colorado gunman shot and killed two people, including a police officer, before being fatally shot by law enforcement.

Officer Gordon Beesley, a 19-year veteran of the Arvada Police Department, responded to a call about a suspicious incident on Monday at about 1:15 p.m. About 15 minutes later, a 911 call came in about shots fired and Beesley’s gunshot wound, according to the Associated Press.