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Some details may be speculative, and may not turn out to be correct.
He was introduced to Niko Bellic by Elizabeta Torres who wanted Niko, along with Playboy X, to accompany Klebitz to a heroin deal. It turned out that the dealers they were meeting were undercover LCPD officers and a gunfight ensued in which Klebitz escaped.
Shortly after, "A Biker" is referred to in a text from Roman, whom kidnapped him for Dimitri, after he is rescued by Niko from the warehouse in Bohan. The biker very well could've been Johnny.
Later on, Pegorino Capo Ray Boccino had Klebitz accompany Niko to a diamond deal with the Jewish Mob, Klebitz betrays Boccino and Niko by having the deal shot up by Luis Fernando Lopez and steals the diamonds. The diamonds are then passed on to the Ancelotti Family.