User blog comment:JAlbor/Dishonored DLC Announced/@comment-216.185.204.15-20130204023526/@comment-27202257-20130204214518

If you spare him, yes. But you also have the option to kill him and still get either the low or the high chaos endings where Emily is crowned. He doesn't actually appear in the ending, but in the timeline of events, there are two possible scenarios where he doesn't live to see her crowned.