Carbon monoxide poisoning is suspected in the death of a Brooklyn woman early Saturday, police sources said.

Nilda Sing, 55, was found by her brother at about 2:30 a.m. in the apartment they shared on Fort Hamilton Parkway near 55th Street in Borough Park, police said.

First responders quickly detected a high level of carbon monoxide in the apartment.

Two weeks earlier, workers used electrical tape to patch a leak in the building’s chimney, said George Anthony, the super.

The patched section of pipe burst in the hours before Sing died, Anthony said. “They didn’t [fix] the chimney properly,” the super said. “The smoke came right to her room.”

The landlord could not be reached for comment.