 During the impeachment process of New York State Supreme Court Justice George G. Barnard in 1872, the first charge that the New York City Bar Association brought against Barnard was that he discharged at least 39 prisoners from the Blackwell's Island penitentiary before their sentence was expired.In 1872, the Blackwell Island Light, a Gothic style lighthouse later added to the National Register of Historic Places, was built by convict labor on the island's northern tip under Renwick's supervision.Seventeen years later, in 1889, the Chapel of the Good Shepherd, designed by Frederick Clarke Withers, opened.