Update: Shelby Runner Found Dead Suffered Heart Attack

An autopsy conducted by Oakland County Medical Examiner's Office revealed a Shelby Township man who had been running along the Clinton River Trail over the weekend, and was found dead Wednesday morning in a Rochester Hills park bathroom, died from a heart attack, the .

According to Detective Ray White, Bob Kosen had been training for the Boston Marathon.

Kosen's co-workers had been concerned when the 62-year-old did not show up to work at Arvin Meritor this week, White said.

Kosen's body was discovered by two Rochester Hills parks employees conducting routine maintenance on the bathroom, which is located beside the trail inside park. The door to the men's bathroom was locked and the employees had to force it open, White said.

Sheriff's deputies arrived on the scene shortly after the 10:30 a.m. discovery. Kosen had identification pinned to his waist. His car was discovered a short time later in a parking lot near off Main Street in Rochester, which is about a mile from where his body was discovered. White said it is not known whether he had just begun his run or whether he was on his way back to his car.

A memorial service will be held Sunday at Lynch and Son's Funeral Home. Click here for more information.