Ethan Crumbley, 15, was found guilty of four counts of involuntary manslaughter. He was given a gun by his mother as a Christmas present.
His mother was also found guilty and faces up to 15 years in prison. The jury took less than an hour to reach their verdict. The judge said the case was not a case of criminal negligence, but of a failure to control a child's actions. The father of the victim said he was shocked by the verdict, adding: 'I thought he was a good boy'