From FindAGrave: US Representative from New York. Immigrated to the United States in 1820 with his parents, who settled in Watertown, Jefferson County, New York. He graduated from Union College, Schenectady, in 1833, was principal of Union Academy, studied law and was admitted to the bar in 1837. In 1841 he was appointed examiner of chancery, supreme court commissioner, and commissioner in bankruptcy and was prosecuting attorney of Jefferson County, 1843 to 1849. He was elected as a Republican to the Thirtieth Congress, March 4, 1847 to March 3, 1849, president of the village of Watertown in 1853 and 1854. His last public service was associate justice of the supreme court 1857 to 1881 and served as it's presiding justice till his death. (bio by:John "J-Cat" Griffith, permission granted to use.)
From the New York Times, published Sept. 3, 1897.
SENATOR MULLIN IS DEAD; Stricken by Heart Disease in His Room in the University Clubhouse. BODY FOUND BY A SERVANT He Was Lying, Almost Fully Dressed, Across the Bed, with His Spectacles On --