Deonte Patterson, Guilty of First-Degree Premeditated Murder for Revenge Killing

Friday, March 28, 2025

WASHINGTON – Deonte Patterson, 29, of Washington, D.C., has been found guilty by a jury of first-degree premeditated murder while armed and other charges for the August 2021 shooting of 32-year-old Ali Jamil Al-Mahdi on 9th Street NW, announced U.S. Attorney Edward R. Martin, Jr. and Chief Pamela Smith, of the Metropolitan Police Department (MPD).

            Patterson also was found guilty of possession of a firearm during a crime of violence and obstructing justice. The verdict was returned following a trial in the Superior Court of the District of Columbia. The Honorable Michael Ryan scheduled sentencing for May 30, 2025. Patterson faces a maximum sentence of life in prison for the crimes.

            According to the government’s evidence, at approximately 2:24 a.m., on August 23, 2021, members of the Third District Metropolitan Police Department were in the area of 9th and T Street, N.W., when they heard the sounds of multiple gunshots. Officers canvassed the area and located Mr. Ali Al-Mahdi in front of 1822 9th Street, N.W., unconscious and unresponsive, suffering from multiple gunshot wounds. DC Fire and EMS personnel responded to the scene and transported Mr. Al-Mahdi to Howard University Hospital where all lifesaving efforts failed, and he was pronounced dead at 3:39 a.m. Surveillance video and witness testimony placed Patterson in the area of the shooting. Mr. Al-Mahdi was shot as he was trying to get to his car. Minutes after the shooting, there was a car crash at 9th Street and Massachusetts Ave N.W., where a car flipped over multiple times. Patterson and a gun flew out from the vehicle during the crash. DNA tied the gun that flew out of the car to the defendant. That gun was consistent with having fired the 40 caliber casings at the shooting crime scene. Other casings at the shooting scene came from an unknown firearm suspected to be return gunfire that hit the defendant’s fleeing vehicle. The defendant’s firearm was in a fanny pack in the backseat of his car. The decedent had previously shot the defendant in 2019, pled guilty, and served time.

            An arrest warrant for Patterson was issued in January 2022 and he was on the run for a year until he was arrested on January 5, 2023. Since being held, the defendant communicated with his girlfriend in several jail calls instructing her not to say anything.

            This case was investigated by the Metropolitan Police Department.

            It is being prosecuted by Assistant U.S. Attorneys Lauren Galloway and Tamara Rubb.