Drury Brown, Thief of Bones, is a Unique Ghost found in the Defiled Crypt in Act I of Diablo III. Unlike unique Ghastly Gravediggers, he spawns in the real crypt.
In combat, he has Electrified and Illusionist affixes.
Killing him is required for the Haunted achievement. It may also be a bounty, in which case the secondary objective is to kill 50 enemies.