Incredible Hulk (2000 series) #69

Hulk fights his clone, who reveals things like his boss (the Secret Conspiracy mastermind) is a brilliant, great leader, and Betty is not what she seems to be. Hulk defeats (kills) the clone because the duplicate cannot increase his strength with anger. To prevent the clone from healing himself back to life, Hulk takes his heart and brains out, smashes them, and spars them. After Doc Samson, and Betty find the clone's corpse, and return to Nadia's place, Nadia tells them that Bruce is gone. We see Bruce walking alone in the middle of the road.