Eileen Dietz was born in New York City along with a twin sister, named Marianne. While Eileen went on to be an actress Marianne lives in Florida and has 3 terrific children. Eileen has been lucky to be involved with many award -winning projects. She was in the original Tony winning Steambath with Tony Perkins and went on to portray the Demon who possesses Regan in The Exorcist, following that was the Emmy-winning General Hospital where she portrayed Sarah a patient in a mental hospital in Port Charles and also the Emmy-winning Helter-Skelter where she was one of the Manson Gang. While these are the award -winning projects, Eileen has been blessed to continue working on many other projects. her latest favorites being The Queen Of Screams, (Norma Desmond meets Carrie in a fiery finish) and Legend Of The Mountain Witch along with The Curse Of The Flesh. There are also scripts in development to which she is attached Lullaby by Edward Romero, Krampus by Amanda Carver, Deadly Rites, and Blood Lust to be shot in England.

Her identical twin sister, Marianne Dietz, is a writer.At the age of just 6 weeks old she and her identical twin sister Marianne appeared in a TV commercial for a soap detergent.Born in New York City and left New York City to come to Los Angeles after The Exorcist was shot. She shot The Exorcist with a SAG principal contract and was contracted to play the part of the demon.As babies she and her identical twin sister Marianne appeared in an ad for a soap detergent.