Winter is a female bottlenose dolphin who, with her story, inspired the films "Dolphin Tale" and "Dolphin Tale 2".
She had become famous after regaining the ability to swim, after an incident caused her to lose her tail.
Following her passing on Thursday, fans will have the chance to say goodbye to her at a memorial at the Clearwater Marine Aquarium in Florida.
Meet Winter and the details of this story on CNN First Morning.