Ray Bulgarin, who believed the diamonds were originally his, thought that the Cook and Gay Tony conspired to rob Ray of the diamonds. Bulgarin decapitated the Cook, leaving his head in a box on a rooftop for Luis Lopez to find when he walked into an ambush, which Lopez escaped.
In the PC versions of Grand Theft Auto IV and The Lost and Damned, the Cook has a beard. However, he is clean-shaven in the PS3 and Xbox 360 versions. In all versions of The Ballad of Gay Tony, he is clean-shaven.
In a funny twist, the box that contains The Cook's severed head is actually the same one used earlier by him to smuggle the cake full of diamonds off the Platypus.
When Jerry Kapowitz discovers the diamonds, he holds them up in exactly the same way that The Cook did, with the camera angling the same way.
The Cook in the PS3, and Xbox 360 versions of GTA IV.
The Cook's severed head Luis found during "In The Crosshairs".
The Cook (Right) meet Luis and Gay Tony in Mission Diamonds in the Rough (TLAD)