Nancy O'Reilly is Blackie's sister and the lover of Jean Renault.


Nancy clung to Jean's side and threatened Emory Battis when Jean requested he bring him Special Agent Dale Cooper.[1]

With Jean, she plotted to kill her sister.[2]

She later encountered Dale Cooper, who restrained her and commanded her to take him to Audrey Horne. She did so and drew a knife when he went to the bed. She prepared to stab him, but he subdued her.[2]


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