WAREHAM, Mass. (AP) _ An 18-year-old twin accidentally shot and killed his brother with a gun he thought was unloaded.

Shannon St. Jacques and his twin brother Kyle were watching television with a female friend Saturday when she showed them several handguns belonging to her boyfriend, police said.

``She thought they were unloaded and started passing them around,'' Wareham Police Sgt. Douglas Jacinto said.

One gun had a single bullet in the chamber. The pistol went off while Shannon handled it and the bullet hit Kyle in the head. He was pronounced dead at a Boston hospital.

``They were very close,'' Jacinto said. ``They did everything together. It's just a tragedy.''

A preliminary investigation determined the shooting was accidental.