During a news conference Friday, Homicide Capt. John Ryan said Schellenger, of Point Breeze, was in a Mercedes-Benz with two other people when the car got stuck in traffic on Chancellor Street near 17th around 10:50 p.m. Thursday. All three men got out of the vehicle in an effort to get a driver in front of them to move, Ryan said. The group then encountered a man on a bicycle, who may have been working as a food courier. An argument ensued and that man, now identified as Michael White, stabbed Schellenger in the back with a knife he had pulled from his backpack, Ryan said. The bicyclist ran from the scene, leaving behind his red bicycle and a bag used for delivering food, Ryan said.