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ST. LOUIS • A St. Louis police officer accused of fatally shooting a fellow officer in January pleaded not guilty Monday to the charges against him.

Nathaniel Hendren, 29, appeared Monday before St. Louis Circuit Judge Thomas McCarthy at the Carnahan Courthouse. He was accompanied by his lawyer Talmage Newton IV in the courtroom where he waived formal reading of the indictment.

Officer Nathaniel Hendren

St. Louis Police Officer Nathaniel Hendren pleaded not guilty on April 29, 2019, on charges of involuntary manslaughter and armed criminal action in the fatal shooting of Officer Katlyn Alix.

Hendren was charged in January with involuntary manslaughter and armed criminal action after police say he fatally shot off-duty officer Katlyn Alix during the early morning hours of Jan. 24.

A St. Louis grand jury indicted Hendren on the same charges on Thursday.

After Monday's brief hearing, Alix's supporters walked through the main lobby of the Carnahan Courthouse shouting, "Lock him up! Lock him up! Lock him up! Justice for Katie!"

Hendren's next court date is scheduled for June 17.

Officer Katlyn Alix

St. Louis Police Officer Katlyn Alix in a photo released by the department. She was shot and killed on Jan. 24, 2019.

Hendren was on-duty the night of the shooting, but he and his partner were at his home outside of the area he was supposed to be patrolling. Alix went to the home as well, and was killed when she and Hendren took turns firing a revolver loaded with one bullet at each other, charges say.

Hendren’s partner, Patrick Riordan, also 29, has not been charged with a crime. He has been put on administrative duty, sources have told the Post-Dispatch.

Riordan said the two skipped a call for a burglary alarm sounding and asked other Second District officers to check it out while they were instead at Hendren’s home, about six miles away, according to sources familiar with Riordan’s statements.

Joel Currier is a reporter for the St. Louis Post-Dispatch. Follow him on Twitter here: @joelcurrier.