What we know about Matthew Ruth’s ex-girlfriend, who accused him of stalking her and torching her truck before he killed three officers?

In York County, Matthew James Ruth ambushed police officers. The incident occurred outside his ex-girlfriend's home. Officers were there to arrest him for stalking. Ruth opened fire, killing three officers. Two other officers were critically injured. Ruth was fatally shot during the standoff. The stalking incident involved a trail camera and an AR-15-style rifle.