sentences:  Christian died of an alcohol-induced heart attack days before the flight, leading to much of his story being told through flashbacks.In the fourth season and fifth season he is again featured on the Island several times, seemingly acting as a messenger for the leader of the Others, Jacob (Mark Pellegrino).In the sixth season, the Man in Black (Titus Welliver/Terry O'Quinn) admitted that he had "impersonated" Christian during the first week after the crash of Flight 815.