Lawyer Howard Weitzman, who successfully defended John De Lorean on cocaine conspiracy and fraud charges, said the former auto executive owes him $683,392 in unpaid legal fees. "Sometimes I don't understand clients, and he's one of them," Weitzman said. "If it wasn't for me he'd certainly be in a different position than he's in now." A Los Angeles Superior Court lawsuit filed by Weitzman and his law firm alleges De Lorean has failed to pay the legal bills or to respond to letters sent to him. Attorney Karen Randall, who is handling the lawsuit for Weitzman's law firm, said De Lorean had agreed orally in April 1986 to certain legal services involving a federal tax trial in Detroit. De Lorean was found innocent in that case. He declined to comment on the lawsuit.