Lennie Jones, who played Morgan in season one, has confirmed that he's been in talks to return to The Walking Dead for season three:
"There have been a few back and forth conversations and they check up on me every now and then. I had a fantastic time working on the pilot with Andy Lincoln and especially Frank Darabont. He's somebody that I'd directorially always wanted to work with and I'm glad I got the opportunity ... There's a possibility I might go back. It just depends on timing-wise if I'm free. At least one of the times they contacted me about it, I was busy doing something else, which I think was actually [BBC series] Line of Duty."