[4] On May 25, 1922, O'Shea and Mary "Molly" D. Shaughnessy of Terre Haute, Indiana, were married in New York City.

[10] In 1926 and 1927, O'Shea made trips to Arizona with a close friend and artist Theodore Criley.

Paintings from these excursions, like the Grand Canyon, resulted in art showings in Pasadena, Tucson, and San Francisco.

[11] O'Shea's wife died on October 8, 1941, at St. Luke's Hospital in San Francisco after a long illness.

[12] The California Palace of the Legion of Honor in San Francisco, exhibited 36 of O'Shea's paintings in April and May 1934.