What an addition Michael Cudlitz has been as Abraham. This is a photo from The Walking Dead episode "Us."
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He was the last surviving prison inmate of the group and his unexpected death was at the hands of the opening shots of the Governor's first assault on the prison. It was the calm before the storm.
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This felt like a long time coming, but Rick was forced to kill his once best friend. On top of that, the undead version of Shane was eliminated by Carl in order to save Rick. Shane just wouldn't stay down.
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Maybe it was shocking T-Dog lasted as long as he did, but he became that underdog to root for. He also went out a hero, letting himself be bitten so Carol could survive.
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This friend of Hershel's family may not have lasted long, but the fact that Shane shot him in order to survive was a surprise. Who knew Shane had it him?
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Her storyline may have dragged on, but it was still a shock to see Sophia stumble out of the barn as a walker. It was a powerful way to end the midseaon finale of The Walking Dead Season 2, especially with Rick finishing her off for good.
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She was crazy to begin with, but the fact that Carol killed Lizzie revealed just how dark the world has become. And it was a bold move by the show itself to not back out from such a controversial death.
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Hershel's beheading initiated the final prison battle against the Governor. It was a graphic death enhanced by the shots of his screaming daughters.
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The Walking Dead Quotes

You walk outside, you risk your life. You take a drink of water, you risk your life. Nowadays you breath and you risk your life. You don’t have a choice. The only thing you can choose is what you’re risking it for.

Hershel

You keep the windows intact, you keep society intact.

Rick