Jack's father died in Australia
First Revealed to: Viewers and Kate
Jack's mother asks him to go to Australia to find his father telling him he has to do it after what he did to his father. It is not known what exactly that was, but it is assumed that some kind of falling out occurred since the two of them have not spoken to each other in two months. Jack goes to Australia to locate his father and ends up finding him in a morgue, dead from a high amount of alocohol in his system causing a massive heart attack.
MEDICAL EXAMINER: The police found him in an alley in Queens Cross.
Now, a tox screen showed a blood alcohol content, which for a man of
his size, probably brought on myocardial infarction - a sizable, and
fatal heat-attack.
Back on the island, Jack and Kate are sitting on the beach and Jack tells Kate that his father died .
KATE: So where were you today Jack?
JACK: Just had to take care of a few things.
KATE: That's all I'm gonna get, huh?
JACK: My father died. In Sydney.
KATE: I'm sorry.
JACK: Yeah. I'm sorry too.
