Guest stars who die before the end

The episode where George Takei dies in the helicopter before the end of the show is kind of shocking, not to mention different.

What other shows feature guest stars (as defined by people in large type at the beginning of the end credits) who also kick the bucket early?

I think we need to define what "end of the show" means, though, because technically speaking, most baddies who die in the show do so before the actual end, i.e., Victor Reese dies a minute or two before the very end of the show...

Maybe before the last 5 minutes are up?