Booie was a chimpanzee living at a Los Angeles animal sanctuary.
He used to have a pretty bad smoking habit too.
He was a chimp that was retired from a research lab and once in the sanctuary was made to quit cigarettes.
Though he did still have one vice: a love of candy!
And he was so intelligent he used to use sign language to try and get people to give him a treat, signing:
"Booie see sweet in pocket."
But now Booie is gone, and the fate of the sanctuary is up in the air now that they've lost their biggest fund raiser, as well as their best friend.
[Image via AP Images.]