A 24-year-old Brooklyn man on an unregistered dirt bike was killed in an accident in front of Kings County Hospital yesterday.

Paul Carthy, of Brownsville, was riding his Kawasaki eastbound on Clark Avenue just after 9 p.m. when a Nissan Altima struck him as it entered the hospital’s parking lot.

In addition to the bike being unregistered, he did not have a license, police said. No criminality is suspected.