Hallows met his wife, Mary Vivian Hurley, while they were both students at Marquette University. They married February 15, 1930, at St. Catherine's Church in
Milwaukee. They had at least two children together. Mary died in April 1973 after a long illness, stemming from a series of strokes. Judge Hallows announced a short time later that he was being treated for
leukemia. He died on September 11, 1974, just a month after retiring from the Court. ==References==