(SANILAC COUNTY)   A 12 year old boy is dead and another is being investigated in connection witha shooting over the weekend in Sanilac County.  Officials say the boys were home alone at a sleepover when the shooting occured Saturday night around 8:30 in the home in Marlet Township in the state's thumb area.  Another boy there called authorities.  There are no details on how the shooting happened or whether any charges will be filed.