Ninette Sosa Unruh accused of killing 16 people in U.S. in 1949 . Courts ruled that World War II veteran was not competent to stand trial . Witnesses and survivors of shooting recount 1949 's horror , aftereffects . Unruh was considered first single-episode mass murderer in U.S. history .
Howard Unruh accused of killing more than a dozen people in New Jersey in 1949 . Courts ruled that WWII veteran was not competent to stand trial . Witnesses and survivors of shooting recount day 's horror , aftereffects . Unruh was considered first single-episode mass murderer in U.S. history .