Whakaotihia te rerenga e whai ake nei: I muri i tana wehenga mai i te Kaunihera, ka tīmata anō a O'Brien i te whakahaere i ōna hiahia pakihi. I mahi ia hei kaitono ki te Democratic National Convention i
I te tau kotahi mano e 1916 I mate ia i Brooklyn i te Mahuru 2, 1924, ka tanumia ki Holy Cross Cemetery.