 Directly after the officers retreated, Crooks opened fire, grazing the former president's ear, killing one rally-goer, critically wounding two others, and this was met with lethal force as a U.S. Secret Service counter-sniper fired four rounds back at Crooks. FBI officials say Crooks apparently worked alone. The president is set to attend another rally in Milwaukee, I guess this is today, as the Republican convention begins today in Milwaukee.