The murder of Kitty Genovese and the bystander effect. · published 2 September 2026
The Kitty Genovese story that founded the bystander effect was largely bad journalism — a neighbour did go to her and someone did call police — yet the lab effect it inspired is real, while CCTV studies of actual street conflicts show that intervention happens in roughly nine out of ten cases and gets more likely as the crowd grows.
These are the working notes, unedited. Everything the video
states as fact comes from here, and nothing else may be stated as fact.
The sections on limits and on what the finding does not show are
part of the brief, not an afterthought — see
the method.
Catherine “Kitty” Genovese was murdered in Kew Gardens, Queens, New York, in the early hours of 13 March 1964. Her killer was Winston Moseley.
Two weeks later the New York Times published an article by Martin Gansberg reporting that thirty-eight respectable, law-abiding citizens watched the killing over half an hour and that not one telephoned the police. That article, and the book Thirty-Eight Witnesses by its editor A. M. Rosenthal, made the case a parable of urban indifference.
The reporting was substantially wrong. Manning, Levine and Collins set out the evidence in “The Kitty Genovese Murder and the Social Psychology of Helping: The Parable of the 38 Witnesses” (American Psychologist, 2007). There is no evidence of thirty-eight people who watched the attack through to its end and did nothing. The attack happened in more than one location, much of it out of sight. Most of those counted heard something rather than saw it, and few had any clear view of what was happening. At least one witness did telephone the police. A neighbour, Sophia Farrar, went to her, found her, and held her as she was dying.
The research the story provoked is real and should not be dismissed with it. Darley and Latané, “Bystander Intervention in Emergencies: Diffusion of Responsibility” (Journal of Personality and Social Psychology, 1968), had participants overhear what sounded like another person having a seizure. The more other people the participant believed could also hear it, the less likely they were to help, and the longer they took. The laboratory effect has been found repeatedly since, and a meta-analysis by Fischer and colleagues (2011) supports it.
What that laboratory finding does not describe is what happens in real public emergencies. Philpot, Liebst, Levine, Bernasco and Lindegaard analysed CCTV recordings of real public conflicts in Amsterdam, Lancaster and Cape Town (“Would I Be Helped? Cross-National CCTV Footage Shows That Intervention Is the Norm in Public Conflicts”, American Psychologist, 2019). Someone intervened in roughly nine out of ten conflicts, and the more bystanders present, the more likely it was that at least one of them stepped in.