It’s sad watching people die on "The Walking Dead." But when some characters die off, new ones emerge and take their place. So while we mourn the most recent loss of Hershel, we can at least look forward to the appearance of three familiar faces from the comic book on which the show is based. (Faces like Abraham, as played by Michael Cudlitz — see photo above.) We chatted with "Walking Dead" exec producer Robert Kirkman to get the scoop on the newbies as well as everything else we need to know heading into the last eight episodes of season 4, which kick off this Sunday on AMC.