Authorities say Albert Dibernardo, of Melville, allegedly struck 44-year-old Ricardo Fernandez, of Amityville, as Fernandez rode his bicycle on Express Drive North in Dix Hills around 10 a.m.
A passing motorist saw Fernandez's body on the side of the road and called police. The bicyclist was pronounced dead at the scene. He was wearing a green, white and yellow cycling shirt and cycling shoes.
Dibernardo was charged with leaving the scene of an accident involving a fatality and is scheduled to be arraigned later Tuesday.
Information on an attorney for him wasn't immediately available.