The community is remembering a 36-year-old mother and Chicago police officer who the Chicago Police Department said was shot and killed a fellow officer during a tactical operation this week.CPD confirms another officer unintentionally fired the shot that killed Officer Krystal Rivera Thursday night in Chatham as officers tried to stop someone who was believed to be armed.

The Chicago police officer killed in Chatham was identified as 36-year-old Krystal Rivera, a mother and a four-year veteran of the police force.

Officer Krystal Rivera was excited to celebrate her daughter's 11th birthday this weekend. But Rivera's life was tragically cut short late Thursday, when she was fatally shot in the back by a bullet fired by another officer.