The partner was the only person who fired a weapon, and the “gunfire unintentionally struck Officer Rivera,” city police said in a statement Friday. An autopsy showed she was shot in the back.

A 4-year-old boy was found uninjured inside a vehicle where a man was shot to death on the city's South Side, Chicago police said.

Chicago Police Supt. Larry Snelling said the officer who unintentionally shot and killed Officer Krystal Rivera is dealing with difficult emotions, and he's urging the public not to draw conclusions ...