STILLWATER, Minn. (AP) – Authorities have identified the body of a man found on the St. Croix (kroy) River shore in Minnesota.  The Ramsey County medical examiner’s office identifies the body as that of 54-year-old Donald Duane Marklowitz Jr.  Washington County sheriff’s authorities say Marklowitz was last seen in Hudson, Wis., on April 1. His body was found Tuesday on the river shore in Lakeland.   Authorities are still investigating the cause of death but say they are not looking for anyone in connection with the case and there is no threat to the public.