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>Matthew J. Ruth was 24 years old and lived in Penn Township, York County, which is near Hanover.
>Ruth was stalking an ex-girlfriend, who he briefly dated, at the farm where the ambush eventually took place, according to court documents.
>Tuesday night, a woman who lived at the farm called police about a man with binoculars looking into her residence through a window.
>The man, later identified as Ruth, was wearing camouflage and spotted on a trail camera standing in the driveway, documents say.
>A mother and daughter, who was the ex-girlfriend, told investigators they installed the trail cam after someone set the daughter's vehicle on fire on Aug. 20.
>The daughter told the officer the person seen on the trail cam Tuesday night was her ex-boyfriend, Matthew Ruth, according to the affidavit of probable cause. The daughter also said Ruth had never been to the farm, nor had he ever been invited there.
>Officers who looked at the trail camera image said they later noticed an AR-15–style rifle slung across Ruth's shoulder.
>Police searched the property for Ruth but did not find him.
>Police requested an arrest warrant for Ruth for stalking, loitering and prowling at night, and criminal trespass.
>When officers returned to the farm the next day, York County District Attorney Tim Barker said Ruth fired upon them immediately as they entered the farmhouse.
>The DA said Ruth had an AR-15 style rifle with a suppressor.
>Barker said Ruth kept shooting at four officers and a sheriff's deputy. He was killed when he walked up to the roadway and was hit in a final exchange of fire.
>In a search of the farmhouse after the ambush, investigators found the family dog, a Labrador, shot to death in the basement of the farmhouse, according to the DA.
>Barker said had the ex-girlfriend and mother shown up at the farmhouse instead of police, "they would have been killed immediately by (Ruth)."