(AP) — The sheriff’s department in Denver says a deputy has been arrested on suspicion that he helped a fugitive who left the county jail wearing a deputy’s uniform.

Matthew Andrews is a two-year veteran of the department. He’s accused of assisting the escape, a class-three felony. The 36-year-old was arrested Monday at Denver police headquarters.

Sheriff’s officials say 24-year-old Felix Trujillo was being held in connection with an aggravated robbery when he escaped Sunday night.

Denver police are trying to determine what motive Andrews might have had for helping Trujillo escape.

Sheriff’s officials say Andrews underwent a background check before he was hired.