Mr. Warren served as a prosecutor on the trial team in a first-degree murder case in the Eastern District of Oklahoma. The trial, held in May 2021 at the federal courthouse in Muskogee, involved the fatal stabbing of Brian James Chaney with a kitchen knife. The defendant, Miranda Ree, claimed self-defense, emphasizing the size disparity between herself and the victim.

Mr. Warren conducted the majority of witness examinations and delivered the closing argument. The jury returned a guilty verdict, and the defendant was later sentenced to over 30 years in federal prison.