What happened to Wong Foo's and Sid?

That's actually a really good question. It seems like Wong Foo's just disappeared when 본즈 and Booth started eating at the Royal Diner. They always played it up like Booth and Sid were friends, so it's interesting that he just dropped off with no explanation written into the story.

Sid also known as Heavy D from the Rap group Run DMC, passed away in 2011 from 심장 disease. He left the show in 2006 due to other reasons including health, but that's what happen to a very talented star.