Several suspects faced police questioning last night in the fatal shooting of a correction officer, who was killed in what investigators believe was a botched robbery attempt, police officials said.

Kenneth Duncan, a 17-year veteran of the New York City Department of Correction, was shot in the head early yesterday morning outside a garage at his home in the Remsen Village section of Brooklyn, police officials said.

Duncan, 40, described by co-workers as a car and motorcycle enthusiast, was shot at about 3:15 a.m. as he attempted to stop two armed men from stealing one of his motorcycles, police said.

Duncan and a friend, a former marine who was not identified by police, were working on a motorcycle in his yard at 8702 Avenue A, where he lived with his sister and mother, when they were approached by the two men. A conversation ensued and the suspects left, a witness told police.

Shortly afterward, the two men returned with a handgun, apparently with the intent to commit a robbery, police said.

The men approached Duncan and his friend, and, following a dispute, one of the suspects allegedly fired at Duncan. It is believed that Duncan returned fire before the suspects fled, police said.

Duncan was rushed to Brookdale University Hospital and pronounced dead at about 3:40 a.m., police said.

Police scoured the area and found the men at a nearby Dunkin’ Donuts; police said they believe the suspects hid at least one pistol outside of the establishment. Police are questioning the men but as of press time had not made an arrest.