The BBC reported there was no independent confirmation of Ibrahim al-Douri's death or word on its cause. He was diagnosed with leukemia several years ago but was able to resume a full work schedule.
The Baath Party's brief statement described him as a "leader of the resistance."
Izzat Ibrahim al-Douri was a native of Tikrit, Saddam's birthplace. He served as deputy commander-in-chief of the armed forces and was on the committee in charge of northern Iraq when the government used chemical weapons on the Kurdish population.
The U.S. government had posted a $10 million reward for information leading to his capture.