It began as a predawn call for the police to a disturbance at an apartment complex in a Denver suburb on Sunday. It ended, officials said, in a fusillade of more than 100 rounds fired by a barricaded gunman who shot five law enforcement officers, killing one of them. The gunman was killed by officers.

Killed in the attack was Zackari Parrish, a 29-year-old deputy who had worked for the Douglas County Sheriff’s Office for seven months, Sheriff Tony Spurlock said at a news conference on Sunday afternoon. He described Deputy Parrish as a “smiley kid” who was eager to serve. He is survived by a wife and two young children.

Describing his meeting with the deputy’s widow, the sheriff said, “When I sat with his wife and held her hand, I could see in her eyes that her life was over.”

Two civilians, who the sheriff said appeared to have been in a neighboring apartment, were also shot. Their injuries were not life-threatening.