Johnson was found guilty of first-degree murder on Tuesday for the killing of Gary DeBartolo and Sandy DeBartolo.
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Investigators said the DeBartolos were killed in cold blood when Johnson and five others tried to steal marijuana from the couple's Kerman home.
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It wasn't immediately clear when Johnson would face sentencing, but he could face the death penalty for the crime.
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The five other defendants have already been convicted in the murder case.
Johnson was also charged with attempted murder, robbery, and mayhem for a separate robbery and brutal attack in Fresno that occurred a few days before the DeBartolos' murder.
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