DENVER – An armed security guard hired to protect a television news crew at a weekend protest shot and killed a protester after he reached into his shirt, causing the guard to fear for his safety, according to a lawyer representing the guard’s family.The security guard, Matthew Dolloff, is jailed for investigation of first-degree murder following Saturday afternoon’s shooting as protesters left a park at the end of competing left- and right-wing demonstrations.Images of the shooting scene from The Denver Post show that Dolloff, 30, placed his body between the protesters and the KUSA-TV reporter that Dolloff was working to protect, the lawyer, Doug Richards, said on Monday.“He was doing what he was supposed to be doing there,” Richards said,.