The Death of Walter White

The end of Granite Slate marked the death of Walter White. When his contribution to Gray Matter was discredited, it marked the destruction of one of the most important accomplishments of his old life. This was moments after his reputation as a father was destroyed by Walt Jr. His reputation, as Walter White, in the eyes of his family and society is now completely tarnished and all that remains is Heisenberg.

At this point he changes his mind on turning himself in and makes the decision to hold off and go out as Heisenberg; not before purchasing an M60 and picking up his ricin--possibly to avenge Hank's death? WWHD.

I'm out like ricin viles from electric fixture covers...