Suffolk police are investigating a fire in Shirley in which a man living in an apartment over a garage died.

Seventh Precinct officers responded to a Manor Drive house at 3:17 a.m. after a 911 call. After the fire was extinguished, the man’s body was discovered in the garage apartment, police said.

Suffolk County police homicide and arson detectives were on the scene and are awaiting a positive identification of the man from the county medical examiner.

VideoPolice: Man found dead after Shirley fire

Police said the cause of the fire appears to be noncriminal.

“It was fully involved on three sides [the rear of the building and the left and right sides],” when firefighters arrived, Mastic Beach Fire Chief Carlo Grover said. He said the roof had partially collapsed.

Grover said firefighters from the Brookhaven department also responded and that the cause of the blaze was not known.

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Workers Sunday morning boarded up the burned out apartment, which is detached and behind the main house. The apartment’s collapsed roof was charred.

Neighbor Angela Aiameo, 79, said she was awakened by a man yelling and saw the fire and smoke. She did not know who lived in the apartment.

Other neighbors didn’t come to the door or declined to comment.