Conversation so far:
Did Edward Canby have his affairs in order
Did Edward Canby make any changes as judge?
Did Edward Canby receive any grave injury from his military career?
Canby faced problems with the Modoc tribe. Captain Jack attacked the general. With Ellen's Man, he shot Canby twice in the head and cut his throat.

Question: was that his cause of death
Self-contained rewrite: Was the attack by Captain Jack the cause of Edward Edward Canby's death?