Associated Press - September 2, 2009 1:25 PM ET

ETHETE, Wyo. (AP) - Fremont County authorities believe a man found in an irrigation ditch on the Wind River Indian Reservation last week died of an accidental drowning.

Preliminary autopsy results in the death of 27-year-old Shawn SunRhodes of Fort Washakie were released this week.

Fremont County Coroner Ed McAuslan said final autopsy results won't be in for another four to six weeks.

Local authorities continue to investigate.

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