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NEW FAIRFIELD, Conn. — A U.S. man fatally shot a masked teenager in self-defence outside his sister’s house and then discovered it was his adopted son, state police said. The father had thought it was an attempted late-night burglary.

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Police said 15-year-old Tyler Giuliano was shot early Thursday in Connecticut.

The woman, who was alone in the house, believed someone was breaking in and called her brother, Jeffrey Giuliano, who lives next door. He grabbed a gun, went outside, confronted someone wearing a black ski mask and black clothing and fired when the person went at him with a shiny weapon in his hand, police said.

When police arrived, the teen was lying in the driveway of the woman’s home with gunshot wounds and the father was sitting on the grass. The teen was pronounced dead at the scene, police said.

Tyler Giuliano had just turned 15 on August 2, reported the Danbury News-Times. He was in tenth grade at New Fairfield High School.