Former Hoboken resident Robert Ranieri III, 29, died Tuesday in a skydiving accident over Lake Tahoe in California.

Ranieri was making a skydive to celebrate opening his new business that teaches people how to operate parachutes, according to his grandfather, former Hoboken assemblyman and councilman Robert Ranieri Sr.

Ranieri III’s first chute twisted and an emergency chute didn’t open, his grandfather said.

Ranieri III’s body was found 15 feet below the surface in Lake Tahoe. The Federal Aviation Administration (FAA) has been holding his body pending an investigation to rule out foul play.

His grandfather said his family is trying to cope with their loss.

“It was a disaster,” Ranieri Sr. said about the tragedy. Ranieri III, a resident of South Lake Tahoe, was a skydiver, volunteer firefighter, and a computer whiz, his grandfather said.

Three years ago, Ranieri III graduated from New Jersey Institute of Technology and was working in computer technology before he died.

When he lived in Hoboken, Ranieri III was a volunteer ambulance driver. He also worked as a volunteer at Ground Zero after 9/11, his grandfather said.

He leaves behind a wife, an 8-month-old child, parents, grandparents and two siblings. After a memorial service near Lake Tahoe, his family plans to have his body brought to Hoboken for his funeral at Lawton-Turso Funeral Home.