Nothing is known about O'Hara's life prior to or as the outbreak began.
At some point, O'Hara made it to the Alexandria Safe-Zone and became a resident.
O'Hara is one of the residents who was killed when the Wolves broke into the Alexandria Safe-Zone and started ransacking houses and murdering residents. O'Hara's body is brutally mutilated by a Wolf as the murderer hacks off his limbs with an axe when Morgan confronts the Wolf. O'Hara's death is avenged as Carol stabs the bearded Wolf in the chest, much to Morgan's disapproval.
- Killed By
- Aaron (Indirectly Caused)
Aaron left his backpack at Del Arno Foods, which causes the Wolves to attack Alexandria.
As the Wolves make their way into Alexandria, O'Hara is one of the many residents to be killed.
This list shows the victims O'Hara has killed:
- Possibly numerous amounts of zombies
- The names written on the memory wall correspond to the filming of each death scene in "JSS." Because of this, this character and Charlyne were just props and their bodies were both laid out at the same time, making this character O'Hara.
- A couple of scenes depict different props used to portray O'Hara. In one scene, O'Hara's arm is severed and in another, his arm is attached while his legs are cut off.