A one-legged hooker was killed in Brooklyn after a john hit her over the head, causing her to fall backwards out of her wheelchair and slam her skull against the wall, cops said yesterday.

Elizabeth Acevedo, 38, was found lying unconscious on the floor of a hallway on the 13th floor of a building in the Wyckoff Gardens houses in Boerum Hill on Thursday morning.

The handicapped hooker, who lived in the building, was taken to Long Island College Hospital, where she died yesterday morning after being removed from life support, police said.

Acevedo - who lost her leg in a train accident - had a rap sheet with 67 arrests for prostitution and drug charges.

She wore a prosthetic leg, but also used a wheelchair.

Investigators believe she had been servicing a client in the hallway who then hit her on the head with a heavy object. Police were still looking for a suspect.