Lori Grimes is the wife of Rick Grimes. A zombie outbreak occurs while her husband is in a coma, driving her to seek refuge in the city of Atlanta with her son Carl and her husband's best friend Shane.
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History
In The Walking Dead #8 we find out that Lori was unfaithful to Rick and slept with Shane during their trip to Atlanta. In this same issue it is revealed that Lori is pregnant and we don't know whether her baby belongs to Shane or Rick.