You can here Dr.Octagon get shot by Dr.Dooom (another of Keiths aliases) at the start of his 'First Come, First Served' LP on Copasetik. The story goes that Keith got fed up with all the licensing/remixes and general success of Dr.Octagon and decided he had to kill him off and re-invent himself as a darker more underground character, and Dr.Dooom was born.