Not the whole story. He was charged with murder, which in South Carolina requires “malice aforethought, either express or implied’. The prosecution couldn’t prove malice. They should have added additional charges to cover all their bases.
Found this "opinion" piece from Jeff Stephens, Dunham's defense attorney is his post election statement on the verdict:
In their verdict of “Not Guilty,” the jury, consisting of seven black jurors and five white jurors, found that the prosecution had failed to meet their burden of proving beyond a reasonable doubt that the defendant intended to harm Mr. Stevens when he shot his pistol towards Mr. Stevens’ moving vehicle. Because Mr. Dunham was not charged with any other offenses and the Solicitor’s Office did not directly indict Dunham for any other or lesser offense, the jury could not consider and give a verdict on any other possible offenses. Mr. Dunham was later released.
I still don't understand how the jury could have reached a not guilty verdict.