A Brooklyn woman was busted last night in the death yesterday of her autistic 11-year-old grandson, whom she had left alone in an apartment where a fire broke out, police said.

Tavon Turpin was in the 15th-floor Coney Island apartment when Melinda McLain, 59, went to a store, a neighbor said.

McLain was charged with reckless endangerment and endangering the welfare of a child. She was treated at for smoke inhalation.

When firefighters arrived at the Ocean Towers on West 24th Street at noon, they found Tavon unconscious in a closet. He died at Coney Island Hospital.

Police believe the boy set the blaze, which had broken out in another closet.

Neighbor Anthony Artist said firefighters worked feverishly trying to revive him.

“They were pumping his chest,” Artist said. “They had an oxygen tank on him and they were trying to revive him. He was covered from head to toe in soot.

“It hurts. I used to put him on the school bus. Everybody loved him. He was like everybody’s kid.”