UpdatedFri, May 14, 2021 at 1:35 pm ET Replies(14) Mass killings — those with four or more deaths — decreased in New Jersey in 2020 during coronavirus lockdowns. But it’s not that simple. (Shutterstock) NEW JERSEY - At least 24 people have died in six mass killings in New Jersey since 2006, according to data compiled by The Associated Press and made available to Patch. At least three of those incidents happened at the Jersey Shore or in South Jersey. Nationally, more than 2,400 people have died in 457 mass killings — defined by The AP as incidents in which four or more people died — in the past 15-year, four-month period.