A late-night argument between two brothers in Mesa, Arizona, ended in fatal gunfire on August 30, 2015. John Paul McAdam, 24, was shot after a dispute with his younger brother, 21-year-old Evan Mathew McAdam, while both were passengers in a vehicle driven by a woman. Witnesses told police the brothers had been fighting just before a gunshot; those witnesses said John was walking away and returning to the vehicle when he was struck.

First responders found John near a home close to the 7500 block of East University just after 12:30 a.m. He was taken to a hospital but died of his injuries. Evan McAdam surrendered at the scene and was booked on one count of second-degree murder; he told investigators he acted in self-defense, a claim that differed from witness accounts. The siblings had a prior disorderly conduct arrest the year before; police have not publicly explained what sparked the deadly confrontation.

If anyone saw the argument that night or has information about what led up to the shooting, please share what is known.