SPOKANE, Wash. -- Coroners performed an autopsy on a University of Idaho student found dead early this week.

Joseph Wiederrick, 18, died from hypothermia, according to medical examiners.

The young student is originally from the Hailey, Idaho area.

Wiederrick went missing after a fraternity party Saturday night. Police found his body under Paradise Creek Bridge in Moscow Monday afternoon.

Toxicology results should be back in two to three weeks.

Meanwhile, the Sigma Alpha Epsilon fraternity, where Wiederrick was partying that night, has issued a statement from its national headquarters:

The Sigma Alpha Epsilon headquarters has learned of a University of Idaho student whose body had been found a day after he was reported missing. According to officials, 18-year-old Joseph Wiederrick had been visiting the Sigma Alpha Epsilon chapter house the evening of his disappearance. He was not a member of the organization.

Sigma Alpha Epsilon offers its deepest sympathies and prayers for Wiederrick's family and friends during this difficult time. In addition, the headquarters has started an investigation and is working with chapter members to determine more information.

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