Denver police have named the suspect in Saturday’s fatal protest-related shooting as 30-year-old Matthew Dolloff, whom they are detaining on suspicion of first-degree murder, according to a tweet from the department Sunday afternoon. The Denver TV news station 9NEWS confirmed Dolloff was a private security guard who had been hired to provide security for one of its employees who was covering the protests, which consisted of a Black Lives Matter-affiliated event and a nearby gathering of right-wing groups dubbed the “Patriot Muster.” Clashes between the two groups were confined to screaming matches and isolated altercations until the shooting occurred in the courtyard of the Denver Art Museum. The shooting victim has not yet been identified.