Each live video showed the view of a killer’s bodycam or rifle-mounted camera. Two assassins had been stationed for over an hour at the north end of Terrasse Dufferin, a quarter-mile promenade overlooking the Saint Lawrence River. The 19th-century wooden boardwalk is a magnet for tourists. In the background is Fairmont Le Château Frontenac. Since opening in 1893, the grandiose, Châteauesque-style façade set the standard for grand railway hotels built across Canada until the early 20th century.
