Osama dead?

Michael Ledeen of the National Review suggests that Osama bin Laden may have succumbed to kidney failure last month:

This historical moment is not easy to understand, since we are in transition from a relatively stable world, dominated by a handful of major powers, to something we cannot yet define, since it is up to us to shape it. It seems clear, however, that there is a greater rapidity of change, accompanied — inevitably — by the passing of the leaders of the old order. This is particularly clear in the Middle East, where seven key figures have been struck down in the past six years: King Hussein of Jordan in February, 1999. King Hassan of Morocco in July of the same year. Syrian dictator Hafez al Assad in June of 2000. Yasser Arafat of the PLO in April, 2004. King Fahd of Saudi Arabia in May of last year. Ariel Sharon of Israel was incapacitated by a stroke in early January. And, according to Iranians I trust, Osama bin Laden finally departed this world in mid-December. The al Qaeda leader died of kidney failure and was buried in Iran, where he had spent most of his time since the destruction of al Qaeda in Afghanistan. The Iranians who reported this note that this year's message in conjunction with the Muslim Haj came from his number two, Ayman al-Zawahiri, for the first time.