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Nothing is known about Sean's life prior to or as the outbreak began.
At some point following the outbreak, Sean joined a large group of survivors known as "the Whisperers".
The group of Whisperers escorting Lydia back to their camp rest in the woods by a creek. Sean stands next to Helen and secretly plots a coup against Alpha, unaware that she is just behind them. Sean and Helen stop talking as Alpha nonchalantly strolls past then. They resume their conversation as Alpha walks away, unaware that she now knows their plan to overthrow her. After finding Henry, Alpha orders everyone to remain alert as they continue their journey back to the camp.
Later, at the Whisperers' camp, Sean and Helen approach Alpha and question why they gave up two people for her daughter. "I don't like that math", Sean whispers. Alpha reminds them she did it to get information. Sean issues a challenge for her leadership role. Alpha laughs in his face and Beta grabs the man from behind and holds a long knife to his throat. "You're changing the rules again", he says calmly.
Alpha confirms he has the right to challenge her position, but she has the right to defend it. She then turns her attention to Helen and suggests it's actually her who wants to be the new leader. Helen tells Alpha she failed everyone by putting them in danger. Alpha tells her that her people voluntarily follow her because she keeps them safe. Alpha then wraps a wire around Helen's neck and decapitates her as a horrified Henry looks on. Alpha then hands the head over to Sean, tells him crying is for the weak and stabs him in the stomach.
Sean and Helen's corpses are later dragged into a field by a pair of Whisperers and are quickly devoured by a herd.
- Killed By
Sean is convinced by Helen to challenge Alpha to be the new leader. However, Alpha brutally decapitates Helen and then stabs a sobbing Sean in the stomach.
This list shows the victims Sean has killed:
- 2 horses (Possibly, Caused or Direct)
- Possibly numerous counts of zombies and unnamed people