We clearly know this is because of the voice actor not being there. But, now we have to pray.
R.I.P William "Bill" Overbeck
1940's-2009
Bill, you were a good man. You were the awesomest one out of the 4. Now that those stupid zombies murdered you, and we cant defib you, (of course) we have taken your gun, and killed every god damn zombie out there.
You will be missed.Amen.