 near the building. A local tactical sniper inside a neighboring building spotted him from a second floor window. Crooks then pulled out a rangefinder and the sniper alerted his team. The shooter then climbed an air conditioning unit onto the building near the sniper's position. And Crooks' father had also contacted police on Saturday saying his son was missing and he was concerned about his whereabouts. The 20-year-old was killed by Secret Service sniper after Crooks killed one person as well as wounding Trump and two others.