Ethan Mattson is a fictional character portrayed by James Andrew O'Connor in the TV series Person of Interest.
They appear in 1 episodes out of a total of 103 aired
Episodes1
Proteus
episode S2.E17 march 2013The Machine suddenly provides six numbers, one of whom has a place on remote Owen Island. Because of a tropical storm Finch and Reese are trapped there with eight others, and one is them is methodically killing the others, one by one.
