Security Guard in ‘Patriot Rally’ Shooting to Face Second-Degree Murder Charge The security guard caught on video gunning down a US Navy veteran at a Denver right-wing rally will be hit with a second-degree murder charge in the viral incident, prosecutors said Thursday. Matthew Dolloff, 30, has been held without bail on suspicion of first-degree murder since shooting Lee Keltner following the demonstration at Denver’s Civic Center Park on Saturday. The city medical examiner ruled Keltner’s death a homicide two days later.