Todd Hubbard, 57, is now charged with murder, assault and theft of service in the death of Dwayne Brown.
Authorities say Hubbard was allegedly harassing two young women on the southbound platform at 125th Street when Brown intervened and a physical altercation ensued.
Brown ended up on the tracks, where he was fatally struck by an approaching 2 train.
Hubbard reportedly has a history of criminal activity dating back to 1982 that includes robberies and multiple arrests for jumping subway turnstiles.
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