DENVER (AP) – Police say a private security guard working for a Denver TV station was jailed for investigation of first-degree murder in the deadly shooting of another man during dueling right- and left-wing protests. The gunfire erupted Saturday afternoon. The Denver Post reports the guard – identified as 30-year-old Matthew Dolloff – was taken into custody after the clash in which another man apparently slapped him and sprayed him with Mace. The wounded man later died at a nearby hospital. Authorities did not reveal his name but family members identified him on Sunday as 49-year-old Lee Keltner.