Denis Keenan married Mary Phelan on 29 November 1851 at Waterbury, Connecticut. The index read: "They were lawfully married by me on the 29th November 1851. Michael O'Neill, Pastor R.C.C. Waterbury.1
- [S740] Town of Waterbury: Denis Keenan and Mary Phelan, 29 November 1851; Marriages: October 1851-November 1854, Including the Town of Waterbury, Page 15.