An autopsy is being conducted today in Portland on a La Pine man found in the Deschutes River yesterday afternoon. Dean Marsh, 58, had been missing since Saturday afternoon. Investigators say it may be tough to come up with a definitive answer in Dean Marsh's death: “In situations like this, its been our experience that it would be very difficult to determine how somebody ended up in the river. Did they jump in themselves, if they fell in, if somebody pushed them in, especially being unwitnessed. So being able to determine that or not, is yet to be known.” Captain Marc Mills of the Deschutes County Sheriff's Office says Marsh was found in the Deschutes River about 1000 yards north of the McGregor View Point, where his truck was parked.