Shane Walsh

Shane Walsh is one of the main protagonists of season 1 of The Moomins vs. the Walking Dead and then the main antagonist of season 2.

Backstory
Shane and Rick were best friends throughout their childhood to them working as local deputies at the King Country Sheriff's Department.

During a shoot-out, Rick is shot in the back, putting him in a coma. Shane visits him in hospital to deliver flowers.

During the first days of the apocalypse, Shane tries to rescue Rick. When this fails due to the soldiers shooting the patients and faculty staff, he barricades the door to Rick's room and leaves.

Shane becomes the leader of a survivor camp and develops a surrogate father relationship with Rick's son, Carl, something that Lori is not happy with.

When Rick shows up, Lori begins to act more hostile towards Shane, telling him to keep away from her husband and son.

In season 2, Shane has shed his concepts of guilt, shame and moral correctness in favor of the concept of survival for himself and those he cares about by any means, even murdering his allies, going against the beliefs of the group, and betraying his former best-friend; leading to his eventual demise.

Shane leads Rick to a field by pretending to look for Randall. However, Rick stabs Shane in the chest, saying that he brought it on himself.

Later, Shane reanimates as a walker, only to get shot by Carl.

Trivia

 * Shane is played by Jon Bernthal.