BELOW: Dale warns Rick that Shane has "had his eye on" Rick's wife: Soon after Rick Grimes arrives at the camp on the outskirts of Atlanta where he finds his wife Lori, son Carl, and friend Shane Walsh, Dale (one of new people he meets in camp) gives him a warning. Dale believes that Shane has "had his eye on" Rick's wife Lori. At this point, he dismisses Dale's concerns because he trusts his friend. After leaving Dale, Rick says to himself that Dale is a "crazy old man." Rick later find out how right Dale was about this. Later, Shane's covetousness even drives him to plan to murder his friend Rick.
Dale: So you're Lori's husband, huh?
Rick: Yeah.
Dale: I don't want to stir nothing up... And you gotta understand this has nothing to do with your wife. She did nothing but talk about you while you were gone... She worried about you. She felt bad about leaving you. But that Shane... He's a good man... He helps out a lot around here... He took care of your wife... But he's not glad you're back. He's had his eye on Lori for as long as I've known them.
Rick: I appreciate the advice, but Shane's my friend. He was just keeping her safe. I don't have anything to worry about.
Dale: I wouldn't trust him around my wife...
Rick: I'll keep that in mind.
Source: The Walking Dead #3 (Dec. 2003): "Days Gone Bye, Part 3", pg. 8, panels 4-6. Written by Robert Kirkman. Art by Tony Moore. See also: thou shalt not covet thy neighbor's wife; Rick Grimes; Lori Grimes; Dale Horvath; Shane Walsh
BELOW: It is revealed that Lori committed adultery with Shane, something she regrets and refuses to continue, despite Shane's continued covetous desire for her: When Lori's wife Rick is out of camp, searching for guns in Atlanta, Shane approaches Lori with the intention of seducing her. She refuses.
Shane: Come back to camp. It's too cold to be out in this rain. C'mon... Staying out here isn't going to make him come back any sooner. I'll keep you company.
Lori: Shane-- Don't. You've got to stop.. Rick is back now... He's alive... And he's my husband. You've got to stop this.
Shane: But what about that night when we-- On the road down here?
Lori: That night-- ... That night was a mistake.
Source: The Walking Dead #4 (Jan. 2004): "Days Gone Bye, Part 4", pg. 21-22. Written by Robert Kirkman. Art by Tony Moore. See also: thou shalt not covet thy neighbor's wife; adultery; Lori Grimes; Shane Walsh