A woman in her late twenties who is both beautiful and has been infected with Medusa, making her the most affected person among the survivors. Despite this, she shows a nurturing side towards Tim, the youngest member of their group. Prior to becoming infected, Katherine struggled with alcoholism and mistreated her son Michael, leading to his removal from her care. This experience deeply impacted her and caused her to seek redemption by being a better mother to Tim. Eventually, the Medusa infection consumes her entire body, turning her into stone.