The incident happened just before noon Sunday, with state police responding to a report of an explosion.
Authorities say the investigation revealed that 28-year-old Christopher Pekny was building a device to be used at a child gender reveal party.
The device exploded, resulting in Pekny s death. State police confirm he was the father-to-be.
His brother, 27-year-old Michael Pekny, was transported to a medical center in Middletown, New York.
The incident remains under investigation by the New York State Police and the New York State Police Bomb Disposal Unit.