We're learning more about Wednesday's shooting in York County that killed three police officers and critically injured two others. The deadly incident happened at a farm in North Codorus Township, where a woman reported Tuesday her ex-boyfriend was stalking her house. Police got an arrest warrant and restraining order but were ambushed trying to serve them. A shooter dressed in camouflage hiding in a cornfield opened fire, killing three officers. As he moved towards the farmhouse, two other officers were wounded. The shooter died in the exchange of gunfire. The names of the dead and injured have yet to be released.