Gary Lynn Wideman, 36, is charged with first-degree murder after deliberation, first-degree murder with extreme indifference and four counts of attempted murder with extreme indifference, the 17th Judicial District Attorney’s Office said.
Wideman also faces two counts of first-degree assault, one count of second-degree assault and six counts of crime of violence.
The shooting happened after several fights broke out at the Extra Point Bar in the 4000 block of East 100th Avenue in Thornton.
Wideman had been thrown out before returning with a handgun then began shooting, prosecutors said.
Brenda Martinez, 37, a single mother and bartender, was killed. Three others were hurt.
Wideman appeared in Adams County District Court on Wednesday. His next scheduled hearing is set for Oct. 26.