Sean Mills was the husband of Sheriff Jody Mills.
Sean was a resident of Sioux Falls, South Dakota. At some point, he married Jody and they had a son named Owen, who later died of unknown causes.
In 2010, Owen mysteriously returned. Both Sean and his wife decided to welcome him back, treating him like normal. However, after a while, Owen developed a high fever and became visibly sick, and the doctor they called could not provide an answer.
As Jody spoke with their doctor on the phone, Sean went to check on Owen, who was resting, only to be attacked and eaten by his son, who had turned into a zombie.