How should “in fact” be used?

Question by flaminmonky: How should “in fact” be used?
I’m writing a story and I was just wondering about this. I know a good bit about grammar, but which one(s), if any, of these is grammatically correct?

Isaac is a Forgotten. In fact, he is the only one of the Forgottens working as a lumberjack.

or

Isaac is a Forgotten; in fact, he is the only one of the Forgottens working as a lumberjack.

or

Isaac is a Forgotten, in fact, he is the only one of the Forgottens working as a lumberjack.

And as a added note, don’t say anything about the “Forgottens” part, it is a name of a kind of people in the story. I just know someone would have said something, so just don’t.

Best answer:

Answer by C Shoe
The last doesn’t work; the first two are acceptable.

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