A Nesconset teen allegedly shot and killed his ex-girlfriend at his home Wednesday morning before turning the shotgun on himself, the Suffolk County Police Department said.

The victim, identified as Emily Finn, 18, of West Sayville, was pronounced dead at the scene, police said. The alleged shooter, who turns 18 on Thursday, was transported to Stony Brook University Hospital in critical but stable condition.

He allegedly used a legally owned shotgun and fired one shot at Finn before shooting himself in the face, said Suffolk police Det. Lt. Kevin Beyrer, commanding officer of the department's homicide bureau.

Beyrer said it was not immediately known who owned the firearm. The teen's name was withheld because of his age, the police said.

Finn had come home from college and gone to the b

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