How can I clear a task from search results?

I completed a task that I remembered was on my "to do" list but it wasn't in my next actions list and I couldn't find it. I did a search and found the task. Unfortunately, I could not mark the task complete from this view and I couldn't tell where the task was located. There's got to be a better way!! Am I missing an obvious way to mark this complete? (I've overlooked the obvious before.) Where is it located?