Prince Bandar bin Sultan, ambassador to the U.S. to Crown Prince Abdullah, has had to tender his resignation due to on going health problems. Bandar has been a powerful head of the Washington diplomatic community and was named envoy in 1983.
There have been several reports of Bandar's struggle with depression over the last several years that led to over use of antidepressants. His leaving doesn't appear to be related to the health of King Fahd, who is still in the hospital in Riyadh.