Kug Ironjaw is an orcish member of the Argent Dawn and was taken prisoner by the Scarlet Crusade in the Scarlet Enclave. When the death knights of Acherus invaded the Enclave, the prisoners traded owners.
Orcish death knights have a chance to execute Ironjaw.
Involved in the following quest:
Kug Ironjaw was previously a friend of yours before you became a death knight. He tries to convince you to remember your life before and not to kill him, before realizing that you yourself will be killed if you fail to kill him. He then tells you to kill him, that he will die "for the Horde".