There was a Dennis D. Shea who married Maggie Harrington. Dennis could be related to Jeremiah Shea but no proof.
"SHEA--Suddenly, November 4, DENNIS D. SHEA, beloved husband of Maggie Harrington and son of Margaret and the late Patrick Shea, native of Dirrnid [Derrynid] Tuosist Kenmare, County Kerry, Ireland.
Funeral from his late residence, 337 Ninth st, Brooklyn, on Saturday, November 8, 1902, at 10 A. M.; thence to St. Thomas Aquinas' Church, Fourth av and Ninth st, where a solemn requiem mass will be celebrated for the repose of his soul."
Brooklyn Daily Eagle, Thursday, November 6, 1902