An immigrant from El Salvador slammed her car into a 45-year-old Long Island man and left him to die on the street in a horrific hit-and-run tragedy, prosecutors said Tuesday.

Silvia Alvarez DeReyes, 46, is now being held without bail for allegedly leaving the scene of an accident and other charges in the Oct. 5 incident — and is facing deportation from federal immigration authorities, the Suffolk County District Attorney’s Office said Tuesday.

“This case underscores the serious consequences of fleeing the scene of a crash,” DA Ray Tierney said in a statement. “When someone leaves the injured behind without contacting the police, they not only break the law but betray the basic standards of decency our community expects.”

Suffolk County DA Ray Tierney said Silvia Alvarez DeReyes will

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