A pedestrian struck and seriously injured Thursday while crossing at a Selden intersection has died, Suffolk police said Friday.

William Gearns, 21, of Eastport, was pronounced dead later Thursday at Stony Brook University Medical Center, police said in a Friday news release.

Gearns was walking across County Road 83 at Middle Country Road about 5:50 p.m., police said, when he was struck by a BMW, driven by Justine Giannone, 25, of Miller Place. Giannone was not injured or charged, police said.

Detectives asked that anyone with information about the crash call the Sixth squad at 631-854-8642, or Crime Stoppers at 800-220-TIPS.

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