An initial call to police Saturday morning reported that a man had fallen from a station platform onto the track area of the Bellmore station after possibly suffering a seizure.
But investigators later learned that a verbal dispute turned into a physical altercation at the station.
34-year old Niheim Levy of Roosevelt has been charged with murder and robbery.
Police say he got into an altercation with the 49-year old Freeport man, whose identity has not yet been released.
The Nassau County and MTA Police Departments are continuing to investigate the incident, which did not involve any trains.