Nothing is known about O'Hara's life prior to or as the outbreak began.
At some point in the apocalypse, O'Hara joined a community called the Alexandria Safe-Zone.
O'Hara is killed when the Wolves invade Alexandria and start ransacking houses and murdering residents. His body is brutally mutilated by a Wolf who hacks off his limbs with an axe when Morgan confronts him.
- Killed By
- Aaron (Indirectly Caused)
Aaron leaves his backpack at Del Arno Foods, which causes the Wolves to locate and 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.