Shane was Rick Grimes friend and partner before the apocalypse working as a police officer. When Rick was in the hospital Shane tried to save him but Rick was still in a coma. Thinking Rick died Shane slept with Rick's wife Lori and became a father figure for Carl, Rick's son. When Rick returned Shane grew jealous of Rick and Lori coming together. Shane also has different views of how to deal with situations unlike Rick who was a pacifist, Shane is all about a survival mentality.