(Boring, OR)  --  Sheriff's deputies say a man wanted in connection with a deadly shooting in Clackamas County was spotted in Iowa last month.  Authorities say Dirck White was seen on a highway near Des Moines, firing shots from his car.  White is suspected in the February murder of 47-year-old Grady Waxenfelter on Highway 224 near Boring.  Investigators say White has an extensive criminal record and is also wanted in Pierce County, Washington, on a weapons charge.