Nothing is known about Sullivan's life prior to or as the outbreak began, other than he possibly lived in Belgrade, Montana.
At some point, Sullivan took shelter in a funeral home with a small group of survivors. Unfortunately, all the survivors, including Sullivan, were wiped out by the Doomsday Cult.
Sullivan's zombified corpse is discovered in a funeral home by Althea and Dwight. Dwight believes Sullivan might be from Alaska, but upon checking his driver's license after he puts him down, Dwight is disappointed to discover Sullivan to be from Montana.
- Killed By
- Doomsday Cult (Alive)
The Doomsday Cult kills everyone in the funeral home where Sullivan is living and he subsequently reanimates.
- Dwight (Zombified)
Sometime after Sullivan reanimates, Dwight drives an axe into his head, killing him.
This list shows the victims Sullivan has killed:
- Possibly numerous counts of zombies
- "Alaska" (Zombified)
- While the driver's license found on this man identifies him as "Sullivan Daniels", his appearance in the photo is that of a middle-aged Asian man, which is completely different from what he looks like as a walker. This is either an error, or is evidence that the driver's license is fake. It is also possible that this man knew the real Sullivan Daniels prior to his death, and kept his driver's license as a memento.
- The driver's license lists his date of birth as March 24, 1948. This would make Sullivan 65 years old, although both "Sullivan" and the man in the picture on the driver's license appear to be younger than that, adding credence to the theory that the license is a forgery.
- The license lists Sullivan's place of residence as 2100 2nd Street in Belgrade, Montana, although it is unknown if this man lived there as well.