Background
McCoy was born in Troy, New York, on December 8, 1859.
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McCoy was born in Troy, New York, on December 8, 1859.
He attended the public schools, Troy Academy, Phillips Exeter Academy and Princeton College. He graduated from Harvard University in 1882 and from Harvard Law School in 1886.
He was admitted to the bar and practiced law in New York City. He was a trustee of the village of South Orange, New Jersey from 1893–1895, 1901–1905, and again in 1910. McCoy was a delegate to the 1904 and 1908 Democratic National Conventions., and was a vice president of the Essex County Democratic committee.
McCoy was elected as a Democrat to the Sixty-second and Sixty-third Congresses and served from March 4, 1911, until October 3, 1914, when he resigned.
He was appointed by President Woodrow Wilson on October 5, 1914, as an associate justice, and on May 31, 1918, as chief justice, of the Supreme Court of the District of Columbia (now the United States District Court for the District of Columbia) and served until his retirement on December 8, 1929. He resided in Washington, District of Columbia, until 1932, when he moved to Cambridge, Massachusetts, where he died on July 17, 1933.
He was interred in Troy Cemetery, in Troy, New New York