Man convicted in shooting death of father on Father's Day

SPRINGFIELD - A Guyton man was convicted of involuntary manslaughter by an Effingham County jury for shooting his father four times and then bludgeoning him with an ax on Father&#39;s Day. <br> <br> Lance Roberson, 19, is to be sentenced next month in the June 17, 2001, slaying of 61-year-old Erven Roberson. <br> <br> Lance Roberson also was convicted Friday of having a weapon during the commission of a crime. He faces up to 20 years in prison for each conviction. <br> <br> Investigators said the elder Roberson had been drinking with a friend when he came home and began arguing with his son. Lance Roberson claimed he acted in self-defense after the elder man attacked him with a pocketknife. He then struck his father on the head. <br> <br> ``The whole argument was stupid to lead to such a violent ending,&#39;&#39; prosecutor Tony May said. <br> <br> Guyton is about 25 miles northwest of Savannah.