Lt. Gov. Win Rockefeller died Sunday after unsuccessful treatments for a blood disorder. His family was present.
Rockefeller abandoned the race for governor last year after the blood disorder was diagnosed.
The great-grandson of Standard Oil founder John D. Rockefeller ranked No. 283 on the Forbes magazine list of the nation's wealthiest people in 2005, with a fortune the magazine estimated at $1.2 billion.
As lieutenant governor, a part-time job, he donated his $34,673 state salary to charity. Arkansas Governor Mike Huckabee and Rockefeller had an amiable relationship.
The governor in 2004 appeared to brand Rockefeller as his heir apparent when he said voters should vote a GOP ticket in 2006.
"I think people will say, 'It was a Republican governor who opened health care and the different highway programs; it was a Republican governor who pushed for increased standards in our schools,"' Huckabee said then.
But that was before former Homeland Security Undersecretary Asa Hutchinson entered the governor's race.
With two Republicans on the ballot, Huckabee was careful not to lean either way.