Chicago Police Officer Krystal Rivera was “unintentionally” shot and killed by her partner when they encountered an armed person during a foot pursuit Thursday night in Chatham, police officials said.

Police Supt. Larry Snelling previously said that Rivera was shot about 9:50 p.m. while chasing a person who she thought was armed into an apartment building in the 8200 block of South Drexel Avenue. Once inside, officers were confronted by another person who was armed with a rifle, and an officer opened fire.

Police now say the officer was the only person who fired a weapon, and that the “gunfire unintentionally struck Officer Rivera.”

The person who aimed the rifle at officers is still being held in custody, police said, and the circumstances that led to the initial stop remain under inve

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