Authorities in northcentral Montana say they will attempt this weekend to find the body of a missing fisherman from Great Falls believed to have died in Lake Elwell. Liberty County Undersheriff Doug Riggin says that 50-year-old John Kumm was reported missing at 6 p.m. Thursday. A search on Friday was unsuccessful. Riggin says the plan for today is to use sonar to locate Kumm's body in an area of the lake that is 25 feet to 110 feet deep. Officials say that on Thursday other fisherman and an employee at Tiber Marina noticed an empty boat near the marina.They initially thought it was just a boat that had broken loose, but the employee later called the sheriff's office.