The Malheur County Sheriff's Office is investigating the death of a 31-year-old man who was shot on the roof of a home in Nyssa, Ore., late Monday afternoon.

Police were called to the residence in the 200 block of South 3rd Street at 5:03 p.m., according to Malheur County Sheriff Brian Wolfe.

"Dispatch received a call that one of the occupants of that home had just shot an intruder," Wolfe said.

When a Nyssa police officer arrived at the scene, he found an injured man on the roof above a porch on the home. Paramedics tried to revive the man, but they were unable. He was pronounced dead at the scene.

Wolfe said a 36-year-old male resident of the house shot the man. He believed, but was not sure, that the man was struck by a single bullet. He declined to release other details about the man's injuries.

Investigators interviewed the residents of the house and others in the neighborhood. They are trying to piece together what transpired.

Wolfe said he did not know if the residents of the house exchanged words with the man on the roof before the shooting. He said he did believe that the man was known to the residents of the house. The sheriff said he did not believe the man who was shot was armed, and he didn't have anything in his possession that didn't belong to him.

"We're really still in the initial phase of our investigation," Wolfe said.

The house has been secured, and the three residents are not allowed back in until the investigation is complete. The sheriff's office is obtaining a search warrant.

The sheriff's office knows the identity of the man killed in the incident, but they did not release his name late Monday. The sheriff said no one had been arrested or charged in connection with the shooting.

The body had not been removed from the scene late Monday night. Wolfe said an autopsy would be scheduled Tuesday.