"That officer is in a very, very tough place; unimaginable what that officer has to be feeling right now," Chicago Police Supt. Larry Snelling said.

Krystal Rivera, a 36-year-old single mother who had spent four years on the force, was rushed to the hospital in a squad car after taking a gunshot wound to the back. The vehicle she was traveling in bizarrely crashed and caught on fire, and she had to be transferred into another vehicle to complete the journey.