A Chicago police officer was shot and killed in the early hours of Saturday morning in the city's Avalon Park neighborhood. The officer, who has not been identified, was headed home from work at around 1:42 a.m. when she was shot in the 8100 block of South Blackstone Avenue. Another officer responding to a gunshot detection system alert found her wounded outside and rushed her to the University of Chicago Medical Center, where she was pronounced dead. According to law enforcement sources, police were investigating whether the slain officer's gun was stolen. No one has been taken into custody. Interim Police Supt. Eric Carter said at a news conference that the officer had served in the Calumet District for three years. Mayor Lori Lightfoot called the shooting a tragedy and said she had spoken with the family of the deceased. Mayor-elect Brandon Johnson called the shooting a "profound tragedy" and vowed to support her family and the police department.