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Though Miss Amurao could not recall having seen the intruder before, he appeared to have some familiarity with the apartment and the girls' movements —possibly by observing them from a playground behind the apartment where men often sat at night and watched curiously as the nurses came and went. Such a mass murder, contended Dr. Edward Kelleher, head of Chicago's Psychiatric Institute, "must have taken some planning. It was not an impulse thing. He was a sexual psychopath, a deep-down woman hater who was completely gratified by what he did."
Power of Paralysis. How could it all have happened? Why did none of the girls scream for help or break away while their captor was out of the room? The answer probably lies in the power of a gun; the helpless victims were evidently paralyzed by the thought that the assailant might shoot them before any move could succeed.