Authorities in St. Louis County are investigating the death of a University of Minnesota Duluth student.

Thirty-one-year-old Michael R. Mayhew of Rochester died on Monday, just one day after taking an Army fitness test. The test at Camp Ripley included a two-mile run, two minutes of sit-ups and two minutes of push-ups.

The cause of death has not been determined.

St. Louis County Medical Examiner Thomas Uncini says the death doesn't appear suspicious.

Mayhew was a 1995 graduate of Rochester Mayo High School and was a member of the 134th Brigade Support Battalion based in Cottage Grove.

He will be buried Friday in Grandview Memorial Gardens in Rochester after an 11 a.m. service at Gloria Dei Lutheran Church.