Last fall, Hailey Steimel was so sick she wasn't even allowed a place on the heart transplant list. She rallied, was placed on the transplant list and, on Feb. 13, the call came that a heart was ready for her transplant. As soon as they got word, several of her classmates rushed to the hospital to conduct a pre-surgery vigil, keeping Hailey company right until she was taken to surgery on the morning of Valentine's Day.
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Whatever their reasons, more than a few stars have decided to walk away from their chosen fields only to get the itch and return -- some more than once. Take a look at some celebrities who have "unretired."