Officials on Sunday were investigating the drowning of a man in a triathlon at High Cliff State Park in Sherwood, Wis.
The Calumet County Sheriff's Department said 42-year-old Doug Witmer of La Grange, Ill., died Saturday morning at the High Cliff Triathlon.
Officials provided no further details about the death, but they did confirm it was a drowning incident.
Family friend Kasey Madden said those close to Witmer were "shocked" and "jolted" by his death, the Chicago Tribune reported.
Witmer is survived by a wife and two children, aged 10 and 6.