New York ? Seven funeral home directors linked to a scheme to plunder corpses and sell the body parts for transplants have secretly pleaded guilty to undisclosed charges, prosecutors announced Wednesday.

The unidentified directors all agreed to cooperate in an ongoing investigation into what investigators describe as an enterprise to steal bone and tissue from cadavers and sell the material to biomedical supply companies for profit, Brooklyn Dist. Atty. Charles Hynes said.

The seven entered their pleas in closed courtrooms and their names were withheld, but defense attorneys said that among those cooperating was the director of a funeral home that took parts from the body of “Masterpiece Theatre” host Alistair Cooke.