Saudi Arabia's King Abdullah receives U.S. Defense Secretary Robert Gates at the king's Riyadh Palace in 2011.
King Abdullah of Saudi Arabia has died at 90, The Associated Press reports.
Abdullah was considered a reformer in a conservative Islamic country. He was suffering from pneumonia and was admitted to a hospital, CNN reports.
He ruled the Middle East's leading oil producing nation – and an ally to the United States – since 2005. Forbes ranked him as the 11th most powerful person in the world in 2014.
The next king will be Abdullah's half-brother, Prince Salman bin Abdulaziz, 79.
Find out more about King Abdullah in this Newsy video:
Gavin Stern is a national digital producer for the Scripps National Desk.