Hasayn Ali Muzabir , formerly al Qaeda's emir of Samarra, was killed in Balad, Iraq on June 2, 2006. Muzabir was a former Intelligence officer (Mukhabarat) for Saddam Hussein’s regime.
Muzabir is only one of many former regime officials who have been found to be working with al Qaeda in the past few years. A list of some of the others can be found here.
(Thanks C.S. Scott at Securitywatchtower.)