(AP) — Oklahoma City police say an off-duty police officer shot and killed a Kansas man outside an Oklahoma City concert.

Capt. Dexter Nelson said Friday that Sgt. Paul Galyon shot 24-year-old Brian Simms Jr. of Olathe, Kan., late Thursday at the Farmers Public Market in Oklahoma City. Nelson says the shooting occurred outside a concert by Chicago-based rap artist Chief Keef.

Nelson says Galyon and another officer were working off-duty outside the concert venue when they saw a man who appeared to be unconscious in a car. Nelson says the officers approached and saw the man had a gun in his waistband.

Nelson says Galyon opened fire when Simms did not comply with orders and confronted the officers. Galyon has been placed on paid leave pending an investigation into the shooting.