A Patchogue woman stabbed to death late Tuesday identified her attacker as her ex-boyfriend just before she died, authorities said Wednesday.

Police questioned and arrested Denny Turcios-Reyes, 18, of East Patchogue. He was arraigned on a count of second-degree murder in the death of Jasmine Davis, 20.

Davis had ended the couple's relationship about 3 1/2 weeks ago, and she drove to his house Tuesday night to retrieve belongings, said Det. Lt. Jack Fitzpatrick, homicide commander.

The pair left the house on foot, Fitzpatrick said, and four doors down and in front of a wooded lot, Turcios-Reyes stabbed Davis. Investigators recovered the knife at the scene. "She then staggered to the door next to the wooded lot and collapsed," Fitzpatrick said.

Davis was still alive, authorities said, when officers arrived after a 911 call was placed. It was then that she issued her dying declaration: Turcios-Reyes was the killer, Suffolk prosecutor Bob Biancavilla said.

The killing marks the second time this week in which police charged Long Island men with attacking someone they dated or had dated. Monday, Nassau police arrested a Williston Park man who they said shot his girlfriend after an argument.

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In 2011, there were 4,615 female victims of domestic violence on Long Island, according to state records.

At arraignment, Turcios-Reyes' attorney entered a not guilty plea on his behalf. He was held without bail.