A man who pleaded guilty to murder after dumping a man’s dismembered head into Lake Lanier has been granted an opportunity to argue the throwing out of his conviction, the Georgia Supreme Court decided Monday. Michael B. Lejeune was charged originally in 1999 for the death of 39-year-old Ronnie Davis two years prior. Lejeune pleaded guilty in 2005 to shooting Davis in the head and killing the man regarding a $250 drug debt, according to the court’s opinion summary.