ARCADIA — A man apparently shot himself to death Friday on the stairwell of a commercial building, police said.

The name of the man, who was in his 50s, was not released pending notification of family members, Arcadia police Lt. Paul Foley said.

“At approximately 9:20 a.m., the Arcadia Police Department was contacted by a 9-1-1 caller who reported a man with a gun in the 500 block of Las Tunas Drive,” Foley said in a written statement. “The caller advised seeing an unconscious man lying on a stairwell at a small common commercial complex and that this man was holding a handgun.”

Officers determined that the man had apparently shot himself in the head, Foley said. He was pronounced dead at the scene.

No suicide not was found at the scene, police said.

The death is being investigated by Arcadia police, as well as the Los Angeles County Department of Coroner.