Detective Mills became Wrath - we know that. He punished him for ENVY.
As for the comment on envy - one can\'t die from envy. It was the actions that caused the death. That is just like any of the other members. The actions brought on the death, in some form.
Maybe it was a plot hole. Or maybe it was the fact that when John Doe did have envy , he knew he had to pay the price. So , he set it up, so that Mills would kill him and he , himself would be punished. Yes, that leaves Mills with the WRATH sin - but that wouldn\'t concern John Doe, due to the fact he is dyin\' for his own deadly sin.
As for my avatars...Like I am goin\' to listen to a gay-ass Green Latern avatar and the ohh-so-cliche\' blinkin\' Tool eye.