Lilah and Holland Manners were two of the best recurring characters on Angel. Of course both characters have shown up on the show after their deaths, it's just that death tends to make their appearances less frequent.

And I find it interesting that, so far, all the people who have commented on this post are lawyers. Not that two commenters really constitutes a pattern, but when you're already aware that the Special Projects Unit is on your case, perhaps it pays to be paranoid.