A Long Island teen has been indicted for the “execution-style” murder of his 18-year-old ex-girlfriend at his Nesconset home, prosecutors said Friday.

Austin Lynch, 18, is accused of using his family’s shotgun to shoot Emily Finn in the back of the head at point-blank range on the morning of Nov. 26, one day before Thanksgiving, the Suffolk County District Attorney’s Office said in a news release.

The two teenagers, who began dating when they were both 14, had recently ended their nearly three-and-a-half-year relationship, investigators said.

Earlier this fall, Finn began her freshman year of college at SUNY Oneonta studying early childhood education, while Lynch remained on Long Island.

About two weeks before the Thanksgiving holiday, she broke off the relationship, after which Ly

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