Helen Louise Morrison (born July 9, 1942) is an American forensic psychiatrist, writer and profiler.
The focus of her research has been to find common personality traits among serial killers.
[1] Morrison was a witness for the defense at the trial of John Wayne Gacy, testifying that he was legally insane because he was "unable to separate from his mother psychologically" and never developed a separate identity.
[2] The jury rejected Gacy's insanity defense and found him guilty.
After his execution, Gacy's brain was removed and was in Morrison's possession.