Wilson’s time on The Walking Dead was initially supposed to conclude in Season 2, but the show’s writers decided to keep Hershel alive to explore the dramatic impact of him losing the farm.
Scott Wilson became a quick fan-favorite on The Walking Dead, as Hershel Greene was the veterinarian healer of the group and sometimes the voice of reason for the Survivors when times got rough.
Hershel would appear via flashbacks in the Season 4 finale, but has not appeared in The Walking Dead since that season, although we now know that will change.
Wilson stayed with the series all the way to Season 4, where he was decapitated by The Governor.