ST. LOUIS (AP) — A man who once served as a St. Louis police officer has been acquitted of murder charges.

The St. Louis Post-Dispatch reports that a jury on Tuesday found 36-year-old James Little not guilty of first-degree murder and other charges related to the death of 32-year-old William Dupree.

Little is a former police officer in St. Louis. At the time of the killing, he was working as a reserve officer in Pagedale as well as a security guard for the Metro mass transit agency. Dupree was a St. Louis County corrections officer.

Both men were off-duty on May 26th, 2013, when Little fatally shot Dupree after dropping off a child he shares with Dupree’s fiancé.

Little’s attorney, Scott Rosenblum, argued that the shooting was in self-defense.