Former NFL star Aldon Smith died at 36. The cause of death has not been released by authorities or family. Former NFL linebacker Aldon Smith has died at the age of 36, but the cause of his death has not been released. The San Francisco 49ers announced the news on June 13, 2026, and shared a statement mourning the sudden loss of the former All-Pro defender. Smith was one of the NFL’s most promising young stars during the early years of his career and made a strong impact with the 49ers before a series of off-field issues affected his time in the league.Aldon Smith cause of death (Aldon Smith/Instagram)NflCatch all the latest Sports News, scores, and highlights in one place. Stay updated with real-time coverage of your favorite games and athletes along with Lionel Messi latest updates.See Less