Durin VI
From Tolkien Gateway
Durin VI was King of the Dwarves of Khazad-dûm when the Balrog was aroused deep beneath the city. The creature killed the King in 1980 T.A., and became known as Durin's Bane. Durin VI was the last reincarnation of Durin the Deathless, and the first to be slain. He was succeeded by his son, Náin.