Officers carried out search warrant at residential building Thursday morning, prior to shootingA 19-year-old will be charged with first-degree murder in the death of a Toronto police constable shot in an exchange of gunfire in the city's northwest end Thursday morning, police say. The shooting happened as officers were conducting an investigation linked to several other incidents involving firearms around the Greater Toronto Area, Toronto police Chief Demkiw said, including one that took place at the U.S. consulate in March. Const. Marc Pinizzotto, 43, was "a hero in life, not death," Demkiw said at a news conference outside Sunnybrook Health...