Doug Henshall stated before series 2 was complete that it would be his 'last.' So honestly, I figured he'd die at the end of S2; but they made some kind of deal to create that little ark of stories.

Killing off main characters is apparently the popular thing to do these days. It almost makes me miss the days when we got in trouble for doing it.

I know. Don't get attached to anyone because next time you look...