Captain ordered the cook to kill Patrick O'Brien , who at first refused but was later forced to do so by the captain .
The four boys cast lots and Patrick O'Brien , a fifteen year old cabin boy , drew the death lot .
Captain ordered the cook to kill cabin boy   , who at first refused but was later forced to do so by the captain .
The four boys cast lots and Patrick O'Brien , a fifteen year old cabin boy , drew the death lot .