Krüger moved here shortly after Jacob, he was part of hos pack in Germany before he moved to Beacon Hills, he was part of his pack for a few years before he left them to form a new pack of his own, with the blessings of his former Alpha.
Jack came to the county as a ghost wolf, looking for trouble, he tore up a few places and roughed up some denizens of the local pub, that was before Krüger was sent out to deal with him. Krüger didn't kill him though, he let him live and Jack was so …
Rina was a wandering ghost wolf, she made was into town just passing through, when Krüger came in looking for a fight, he saw her, smelled what she was and challenged her, right there in the bar, as drunk as he was, she wasn't even sure what he had said …
Ryan found g is way to Beacon Hills with his brother, shortly after they got there, his brother got into a fight and killed a man at the bar, he didn't change or do anything out of the ordinary, but he did draw attention to himself. Krüger found them …