Prosecutors and police allege the person responsible for the teens' deaths is a man both girls had previously dated. The suspect was identified by prosecutors as 21-year-old Anthony Nunnally, who is now charged with two counts of first-degree murder. WATCH HERE WATCH HEREHe is currently in Cook County Jail on a carjacking charge, and on Wednesday a Cook County judge ruled during his detention hearing that Nunally will stay there until this case goes to trial. According to Chicago police, 17-year-old Gabriella Arellano was found shot to death in the 11000 block of South Mackinaw Avenue on Oct. 26, 2025. In court, prosecutors said Nunally’s cellmate in the Cook County Jail wore a wire and recorded him talking about the shootings.