The autopsy on Duane R. Jussila has been completed.
Officials say the results of the autopsy have concluded that the probable cause of death was drowning. They are still awaiting toxicology results for the victim, which could take another two to four weeks.
Jussila, a 74-year-old from Hurley, WI, was reported missing on July 5. His body was found on July 27 in his vehicle submerged 10 feet under water in a series of caves near Alfred Wright Blvd. in the City of Ironwood.