Conversation so far:
Did Edward Canby have Edward Canby's affairs in order?
Canby was the only general to be killed during the Indian Wars.
Do they celebrate his works?
CANNOTANSWER.
Did he make any changes as judge?
CANNOTANSWER.
Did he receive any grave injury from his military career?
With Ellen's Man, one of his lieutenants, he shot Canby twice in the head and cut his throat.

Question: was that his cause of death?
Self-contained rewrite: was getting shot twice in the head and his throat cut Edward Canby's cause of death