Wow. Just realized he is not American.
So I'm just recently started watching the Walking Dead and finished all the seasons on Netflix.
I thought they picked someone from a particular region in the South like around Georgia, Louisiana or Alabama or thereabouts. His southern US accent is impeccably accurate IMO.
Some of his enunciation did seem off like "Carl" - how he pronounced that. But I took it as a regional southern dialect.
Then last night I saw his video on Youtube and my mind was blown. He was speaking in a very British accent and I then looked him up on IMDb and realized he is actually British!!!!
Wow....
I actually prefer his American accent rather than his British because I first heard him speak that. That is now embedded in my head for him.
Also, he looks quite like Viggo Mortensen.
Looking forward to Season 5 and his "Kar-lllllll" and his dragged out southern accent.