Hi.
I've just watched season 4 again and wondered, has Jack ever killed anybody on lost? The only time I can think of him getting close was when he pulled the trigger on John, but the gun didn't work. This got me wondering, is this like a Michael thing, that John can't die OR more interestingly, Jack is unable to kill anyone. I believe that the island has bigger plans for Jack and he has to be somehow "pure", in order to fulfil his destiny so in the same way that Michael was unable to die, Jack is maybe unable to kill. Just a theory but what do you think?

Jack put the U.S. Marshall "out of his misery", after Sawyer shot him in the chest and collapsed his lung. Jack chose to save Boone and let Joanna drown (although Jack did say that he thought he would have time to go back and rescue her also)

Off the island, Jack did surgery on Mr. Busconi and he died on the operating table.

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It was Jack and Sayid who created the plan to kill the Others sent to kidnap some of the women.

I heard he killed JFK.

I should have known.

Well, as Queen said Jack put the U.S. Marshall "out of his misery" so that pretty much puts a big hole in a theory that Jack is unable to kill. But this did make me think about how much Jack changed during his time on the island.

And even though the gun that Jack was pointing at Locke was unloaded, Jack didn't know that. Jack pulled the trigger. This seems significant to me. Jack made a decision to kill Locke. And I know a lot of events lead up to this moment, not the least of which is the fact that Jack witnessed Locke throwing a knife in Naomi's back, which of course lead to her death. But when Jack pulls the trigger on Locke it is not a heat of the moment thing with Naomi's death. But Jack still pulls the trigger.

I am not so sure if pre-island Jack makes the same choice.

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Doctor playing golf. Woo, boy howdy, now I've heard everything. What's next, cop eating a donut?

Yeah, only the Marshal as far as I can remember. He has definitely felt guilty for people's deaths like Boone and some others during the early days on the island. Everyone warns him not to kill, like not to kill Locke. They know that he will change and never be Dr. Jack again after that.

It was Jack and Sayid who created the plan to kill the Others sent to kidnap some of the women.

Which is why he and Sayid have the blood of those men on their hands. Those men could have been captured, considering that they were only planning to kidnap some of the women. Instead, Jack and Sayid deliberately planned their deaths.

hardly murder.
killing someone to protect innocent women from being kidnapped and possibly killed is hardly murder.