Looks like Robin Williams' health problems are more serious than was previously thought: The Oscar-winning comic will undergo heart surgery in south Florida. An earlier statement from the 57-year-old actor said he was "experiencing shortness of breath" and that doctors were "recommending a week of rest." The surgery to replace his aortic valve will force the cancellation of Williams' one-man show, Weapons of Self-Destruction, which was headed to Broadway this spring. Now his reps say the tour will continue in the fall. "I'm so touched by everyone's support and well wishes," Williams said in a statement. "This tour has been amazing fun and I can't wait to get back out on the road after a little tune-up."