Shane Walsh (TV Series) – Walking Dead Wiki

"There is nothing easy about taking a mans life no matter how little value it may have. But when you get it done, you have to forget it. I guess I haven't quite got that last part down." Shane to Andrea[src]

Shane Walsh is a main character and later an antagonist and survivor of the outbreak in AMC's The Walking Dead. He is the primary antagonist of Season 2. He was Rick Grimes's partner at the King County Sheriff's Department and his best friend since high school. After the initial outbreak, Shane began to harbor feelings for Lori, Rick's wife. He later became one of the main members of the survivor group camped outside Atlanta. After leaving the camp and finding Hershel Greene's farm, Shane quickly caused tension among the survivors, especially Rick. He is known for being one of the earliest survivors to adapt to the nature of the post apocalyptic world.

Shanewas Rick Grimes's partner in the King County Sheriff's Department and best friend since high school. When the apocalypse occurred (with Rick in a coma) Shane helped save Lori Grimes and Carl Grimes by fleeing with them toward Atlanta.

During the first season, Shane was largely the deuteragonist, having lead the group until Rick's arrival, and continued to be the de-facto second-in-command through out the first and second seasons, much to his apparent dismay, causing tension between the two former partners. During his incursions with Lori, he developed an obsession with her; and was never able to get his head around the fact that Lori left him for Rick, who was thought to be dead when he and Lori had their sexual encounters. Despite his strong leadership abilities, combat proficiency, skill with firearms (having been a former gun instructor) and protective instincts, Shane is largely morally unstable, and by the second season, he has only one motive, to keep himself, Lori, her unborn child (who he believed to be his) and Carl safe, no matter what the cost. He believes himself to have the most pragmatic view of the apocalyptic world, and most qualified to lead the group in the post-apocalyptic hell in contrast to Rick whom Shane believes has good intentions that do nothing but cause disaster and interference and are likely to cause the entire group to be killed. By the second season, Shane becomes more of an antagonist, having 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.

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Shane Walsh (TV Series) - Walking Dead Wiki