A St. Louis, MO, police officer pleaded not guilty Monday to charges connected to a fellow officer's shooting death, reports NBC News.

Nathaniel Hendren, 29, was indicted by a grand jury last week with involuntary manslaughter and armed criminal action for the Jan. 24 fatal shooting of Officer Katlyn Alix, who was off duty when she was killed.

Hendren is under house arrest on a $100,000 bond.

Alix, Hendren, and another on-duty officer were at Hendren's apartment in the early morning hours when they played a deadly game — pointing a loaded revolver, chambered with one round, at each other and pulling the trigger, police said.

Alix, 24, was shot once in the chest before she was rushed to St. Louis University Hospital, where she died a short time later.