The fatal shooting happened about 11:20 p.m. in a basement unit of a two-story tan brick building in the 6200 block of South St. Lawrence Avenue on the South Side.
During a gathering inside the apartment, a 16-year-old boy and his girlfriend began arguing. Another male intervened, and he and the 16-year-old began fighting
The male who intervened left the apartment but returned soon after and shot the 16-year-old in the chest.
The boy was talking but in critical condition when first responders arrived on the scene. He was pronounced dead at John H. Stroger, Jr. Hospital of Cook County at 12:05 a.m