Robin Williams [ tickets ] has postponed the remainder of the tour dates for his one-man show, "Weapons of Self-Destruction," to undergo heart surgery, according to a statement posted on his website.

Williams was in Florida when he announced the cancellation of four shows in that state after experiencing shortness of breath. When the 57-year-old actor was told he needed an aortic valve replacement, the remainder of dates on his 80-city tour were put on hold. A spokesperson said the tour, which kicked off in September, is expected to resume in the fall.