The accident occurred On July 1, 1914 while Miss McHugh and Owen Carter , a camera man , were engaged in making a scene in a picture entitled Across the Border . She was fording the stream in a boat , and suddenly the watchers saw the boat capsizo and Miss McHugh was plunged into the swollen stream . Carter , without hesitation , plunged into the river and succeeded in getting Miss McHugh to a sandbar . They appeared to tie safe , when suddenly both sank from view , and it is believed they were sucked down by quicksand . .