On the afternoon of August 1, 2022, 17-year-old Dimari Chapple was seated in the St. Louis Gateway Transportation Center when a man in a full ski mask approached and shot him once in the head. The attack occurred around 3:20 p.m. near South 15th and Spruce streets while the station was crowded; witnesses scrambled for safety. Surveillance footage showed the shooter loitering before walking directly up to Chapple and firing. An anonymous witness reported hearing the gunman say What’s up now? before producing a revolver and shooting the teenager.

Police apprehended 21-year-old Montrel Alexander shortly after the shooting on a MetroLink platform. He was charged with first-degree murder and armed criminal action, and prosecutors have noted the apparently random nature of the attack. Court filings mention Alexander’s history of mental health issues and that he admitted to the shooting in a recorded interview, acknowledging he knew his actions were wrong. Chapple’s mother wrote that her son was taken for nothing at all and expressed forgiveness while hoping he would get help.

Are there witnesses or anyone who recalls the moments before the shooting at the Gateway Transportation Center who could add detail to what led up to this attack?