A driver was killed and two of his three passengers were seriously injured in a single-car crash Sunday night in Hewlett, Nassau County police said.

One of the seriously injured passengers was an 11-year-old boy, police said.

Carlos Salazar, 20, of Far Rockaway, was driving a 2005 Honda north on Peninsula Boulevard at Avon Road just before 10 p.m. when “it left the roadway and struck a tree,” police said Monday in a news release.

Salazar was pronounced dead at the scene, and two of his passengers, the boy and a 23-year-old man, were taken to a hospital with serious injuries, police said.

Another passenger, a 24-year-old woman, also went to the hospital; her injuries were described as non-life-threatening by police.

Police did not detail the relationship of the victims.

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The car was impounded, police said, and homicide detectives are investigating.

Peninsula Boulevard resident Celina Bialt told News 12 Long Island the scene of the crash was “one of the worst things I’ve ever seen in my life.”

“I heard the crash. I ran out. I saw a whole bunch of smoke and I heard a child crying,” Bialt said.

“And I ran over to the car . . . It was wrapped around this tree. I saw the driver. I could tell he was gone.”

With John Valenti