She went to sit outside on her break around 1:30 p.m., though, when she was caught in the crossfire of a shooting in the 4700 block of Brown Street.
The mom of three was rushed to the hospital, where she died that evening, officials said.
Mayor Jim Kenney said Fletcher was a "dedicated, passionate, and driven" city employee.
“Words alone cannot express the outrage, hurt, and sadness all of her colleagues feel tonight," he said. "I was beyond appalled to learn of this heinous and senseless crime that has completely devastated so many people, especially her family."
Commissioner Ott Lovell said: “Rec centers should be safe havens in our city. The use of deadly weapons in and around our parks and playgrounds is unconscionable."
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