Number of people killed while riding the Coney Island Cyclone roller coaster:

May 26th marks the anniversary of the first, and most infamous, death on the wooden roller coaster known as the Cyclone. A 29 year old Brooklyn man died from head injuries after he stood up in his car and his head struck a crossbeam. The second death occurred 3 years later when an Astroland employee on his lunch break took a ride and fell to his death. He was also reported to be standing up in his car.
Source: Ray Dademo, It Happened Here, Time Out New York, 5/24/2007