On the evening of October 24, 2017, 16-year-old Caleer Miller was shot on a sidewalk at 12th and Ritner streets in South Philadelphia and later died at a hospital. A promising basketball player at Mastery Charter School, Caleer had been with friends when they encountered another group of teenagers and an altercation broke out. A lone gunman produced a .45-caliber handgun and fired; investigators concluded the victims were not specifically targeted and robbery was not a motive.

Also killed in the exchange was 16-year-old Salvatore DiNubile. Police identified 16-year-old Brandon Olivieri as the shooter; an arrest warrant led to his surrender and he was charged as an adult with both killings. At trial, testimony described a dispute between Olivieri and DiNubile and said Caleer was an unintended victim struck by a stray bullet during a struggle over the weapon.

Anyone who knew Caleer, his routine, or saw what happened that night is asked to share information.