The incident took place in Levittown just before midnight on Thursday, April 27.
According to police, the victim, a man approximately 60 years of age, was crossing Hempstead Turnpike going north near Jerusalem Avenue.
While crossing, he was struck by a 32-year-old driving a 2013 Nissan Altima traveling west on Hempstead Turnpike.
Authorities report that the man suffered severe head and chest injuries and was transported to a local hospital, where he is currently listed in serious condition.
No other injuries were reported.
The investigation is ongoing.
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