The Wall Street Journal is reporting that Steve Jobs had a liver transplant in April:
Steve Jobs, who has been on medical leave from Apple Inc. since January to treat an undisclosed medical condition, received a liver transplant in Tennessee about two months ago. The chief executive has been recovering well and is expected to return to work on schedule later this month, though he may work part-time initially.
Mr. Jobs didn't respond to an email requesting comment. "Steve continues to look forward to returning at the end of June, and there's nothing further to say," said Apple spokeswoman Katie Cotton.