The "Oz" star who allegedly killed a man by knocking him down an elevator shaft during a fight at a trendy Manhattan club over the weekend strolled out of court with his mother after posting $5,000 bail Sunday.

Granville Adams, 43, an actor in the hardcore HBO prison series, was charged with criminally negligent homicide in the death of Orlando Valle, 35, a Bronx father who was celebrating his birthday before the deadly scuffle Saturday at the posh Chelsea nightclub BED.

Adams -- who played a tough-talking convict and leader of the fictional prison's Muslim inmates on the critically acclaimed show -- could face four years behind real bars if convicted on the felony charge.

His lawyer, Edward Kratt, said his client was attacked from behind and was defending himself when Valle was killed in "a tragic, unfortunate accident."

Kratt said Adams was working as a host in the nightclub -- a hot spot that sports beds for patrons -- and was once featured on another HBO hit, "Sex in the City."

Shortly before 4 a.m., Adams saw the club's coat-check girl being assaulted by a female patron and went to break up the fight, Kratt said. Sources said the woman checking coats is Adams' girlfriend.

As he was separating the women, Adams was hit in the back of the head with a beer bottle, Kratt said. At about the same time, he felt Valle jump on his back.

Kratt said Adams reeled around and threw the man off.

Police said Valle, whose niece, Tiffany Turner, 20, was involved in the scuffle with the coat-check girl, was thrown into a club elevator door that gave way. Valle plunged five stories to his death.

Sources said the elevator had been recently repaired, although it was unclear for what.

A city Buildings Department spokeswoman said the elevator had passed all of its inspections.

An inspector called to the club said the force of the men's bodies against the door popped it off its rollers.

Kratt said Adams remained after the brawl, dazed from the blow to his head and not knowing that Valle had crashed through the elevator door.

Adams appeared in Manhattan Criminal Court wearing gray jeans, a black blazer and a white shirt, the same clothes he wore at the club.

He must return for an April 12 hearing. He left the courthouse arm-in-arm with his mother then returned to his Brooklyn home to change clothes and grab an overnight bag.