Chimpanzee victim St. James Davis v. West Covina
A link to an article about it. They went to visit their former pet chimp for its 39th birthday and when they got out the cake, a couple of male chimps got loose and attacked.
This second link is a picture of St James Davis and I warn it is gruesome.
http://img.thesun.co.uk/multimedia/archive/00521/man-with-no-nose_68_521494a.jpg