Leonard Chaney's assistant who initially supports his experiments but grows horrified by his escalating crimes. She warns against the human transplant, drugs Dr. Bryan to help her boss, and eventually urges Leonard to kill the captive victims. She is later strangled by Dan and her eyes are harvested by Leonard.
Katherine's professional involvement ultimately becomes the physical means of Nancy's restored vision.
Katherine assists the eye-transplant experiments, and after her death her eyes are harvested and transplanted into Nancy.
Katherine directly participates in Dan's abduction and mutilation.
Katherine drugs Dr. Dan Bryan so that the doctor can harvest his eyes for Nancy.
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