The body recovered Monday from the icy waters of a Wisconsin river is the son of Green Bay Packers offensive coordinator Joe Philbin, Oshkosh police told FoxNews.com. 

Foul play is not expected and the autopsy for Michael T. Philbin, 21, who was reported missing Sunday night, is being conducted. It will likely take weeks before a cause of death is determined. 

Early Sunday morning, a witness told police he heard a man yell for help and spotted a person in the Fox River in Oshkosh, about 50 miles south of Green Bay. Authorities responded to the report, but were unable to locate a body. The search continued all day Sunday.

Later that day, friends informed police that Michael, who reportedly visited the University of Wisconsin-Oshkosh to visit friends, did not return to the residence he was staying

Police determined that a non-distress cell phone communication was sent from Michael’s phone near the river at 2:10 a.m. They are trying to determine if alcohol was a factor in his death.

The elder Philbin, 50, has been the offensive coordinator of the Packers since 2007 and interviewed last week for the Dolphins' head coaching vacancy.

The Packers had a bye this past weekend, and will host the Giants in the Divisional Round next Sunday. Police delayed releasing the identification according to the wishes of the Philbin family.

FoxNews.com's Edmund DeMarche and Newscore contributed to this report.