The boy, who is 15 years old today, was acquitted by Ystad district court of aiding and abetting the murder. He was also acquitted of attempted murder.
Two other boys were convicted by the district court of murder and incitement to murder, respectively.
The police investigation has shown that the boys had been hired for a revenge action after the 56-year-old's son had come into conflict with a criminal gang with links to the Foxtrot network.
According to the district court, the plan was to kill "all men in the residence". Two sons in the house had left home just 40 minutes earlier.
The fatal shooting occurred in Skurup in August last year.
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