A 30-year-old man was shot dead in a hail of bullets during an argument at a Brooklyn pier Sunday morning, police said.

John Garvin was blasted in the head and body multiple times when a dispute exploded into violence near the Belt Parkway and Rockaway Parkway at the Canarsie Pier around 3:14 a.m., police said.

Medics rushed the bullet-riddled victim to One-Brooklyn Health-Brookdale Hospital Medical Center, but he could not be saved.

Garvin lived about a half mile away from where he was killed.

It wasn’t immediately clear what the tiff was over, police said.

His grief-stricken family wept and embraced at the blood-soaked crime scene hours after…

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