On the morning of January 5, 2026, Steffon Marmon, a 19-year-old African American man from St. Louis, was shot and killed on the 2000 block of Switzer Avenue in Jennings, north St. Louis County. Officers from the St. Louis County Police Department arrived shortly before 2:30 a.m. and found Marmon suffering from gunshot wounds; he was pronounced dead at the scene. Detectives from the Bureau of Crimes Against Persons have taken over the investigation.

Few details have been released about a motive or any suspects. Homicide detectives are actively pursuing leads and have appealed to the public for information, and tips may be provided anonymously through CrimeStoppers, which is offering a potential reward for information that leads to an arrest. If anyone witnessed the shooting or has information about Steffon’s activities that night, please contact investigators.