A 27-year-old bicyclist was killed when a hit-and-run garbage truck driver slammed into him in Brooklyn early Saturday, police said.

Neftaly Ramirez was riding his black and yellow bike on Franklin Street near Noble Street in Greenpoint around 12:30 a.m. when a green and white sanitation truck with yellow writing — which cops believe was private — heading south on the same street rammed into him before taking off, according to police.

First responders pronounced the bicyclist, who suffered severe trauma, dead on the scene.

It was unclear Saturday morning whether the driver knew he that he had struck the bicyclist. No arrests have been made.