Credit: Wrestling Information Archive
Event: NWA TNA's Slammiversary 2006
Date: June 18, 2006
Location: Orlando, Florida
Arena: Universal Studios
Attendance: 900
NWA World Heavyweight Title Match (King of the Mountain Match): Jeff Jarrett defeated Christian Cage, Abyss, Ron Killings, and Sting (23:00) in a "King of the Mountain" match to win the title. After the match, TNA Comisioner James E. Cornette takes the title from Jarrett when the match was ruled a No Contest.
AND....
Under Current NWA Champions they list the NWA World Heavyweight Title as Vacant so maybe Jarrett is NOT the champion.
I hope....