Chris Costner Sizemore

About Chris Costner Sizemore

Chris Costner Sizemore (born Chris Costner April 4, 1927) is a woman who, in the 1950s, was diagnosed with multiple personality disorder. Her case was depicted in the book and film The Three Faces of Eve by her psychiatrists, Corbett H. Thigpen and Hervey M. Cleckley. She lived for many years in South Carolina.

In accordance with then-current modes of thought on the disorder, Thigpen reported that Sizemore had developed multiple personalities as a result of her witnessing a horrifying accidental death and two serious nonfatal accidents within three months as a small child. By Sizemore's own report, these incidents triggered the evidencing of selves which were already present. "Despite authorities' claims to the contrary, my former alters were not fragments of my birth personality. They were entities, whole in their own rights, who coexisted with my birth personality before I was born. They were not me, but they remain intrinsically related to what it means to be me."

While The Three Faces of Eve was written by Thigpen and Cleckley with limited input from Sizemore, her later books I'm Eve and A Mind Of My Own fill in details. According to psychiatrists who worked with her after she moved from South Carolina, Sizemore did not experience three selves, but approximately 20. The doctors reported that her selves presented in groups of three at a time.