Robert Reitmeier, 25, was found guilty in the beating death of Mark Mariani.
Mariani was walking down a northwest alley, heading for his parked car, when he was savagely kicked and stomped on Oct. 3, 2010.
The 47-year old was frail with Crohn's Disease and unable to defend himself.
Tyler Sturrup, 28, who helped found the Western European Bloodline supremacist group, had earlier pleaded guilty to second-degree murder in Mariani's death.
He admitted in court to attacking Mariani for no reason.
A conviction of second-degree murder carries an automatic life sentence with no parole for at least 10 years. The jury that convicted Reitmeier will later deliberate on the question of parole eligibility.
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