Monday, June 17th

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Todd Mahoney, 38, a Madison firefighter, died after being found unresponsive in Lake Monona during an Ironman 70.3 Wisconsin triathlon. He was the second person to die after the race.(Photo: Courtesy of Madison Fire Department)

A Madison firefighter on Tuesday became the second person to die after the swimming portion of a triathlon on Lake Monona, authorities said.

Todd Mahoney, a 38-year-old firefighter with the Madison Fire Department, was found unresponsive in the water Sunday morning during the Ironman 70.3 Wisconsin triathlon and was in critical condition until Tuesday, when he died, fire officials said.

About an hour earlier, Michael McCulloch, 61, of Cottage Grove was found unresponsive in the water. Paramedics took him to a hospital, where he was pronounced dead. Preliminary autopsy results indicate McCulloch died from an apparent accidental drowning.

The Dane County medical examiner’s office said preliminary autopsy results confirm that McCulloch’s death “was consistent with an accidental drowning due in part to a medical event.