True Blood
Pour one out in loving memory of Nathan Parsons’ evil-man goatee. Nathan and his scary facial hair joined the cast after Luke Grimes reportedly left the show. Though it's unconfirmed, apparently he left due to being uncomfortable as a gay character. The cast and crew alike were reportedly "baffled and angered" by the decision, but the show was better off without him.
That 70's Show
Things get a little darker when you consider this star's fall from the small screen. Lisa Robin Kelly dropped out of the role due to her addiction to excessive drinking. "With That ’70s Show, I was guilty of a drinking problem...and I ran," she told ABC. Christina Moore took on the role after her departure, but fans and Kelly were both sad to see her go.