CHICAGO (CBS)– Rough lake conditions prompted organizers to cancel the swim portion of the Chicago Triathlon on Sunday, and participants instead competed in a duathlon.

According to officials, the swim portion was canceled due to “unfavorable swim conditions.”

The Duathlon began from the swim start area on the Lakefront Path.

Officials said this was the first time in 37 years a portion of the race has been canceled.

In an incident Sunday morning that was not related to the Triathlon, two people were pulled from Lake Michigan near Fullerton Drive and one later died.

A 26-year-old man was taken to AMITA Health St. Joseph Hospital, where he was pronounced dead. The other person, a 35-year-old man, refused medical attention.

A man’s body was also pulled from the nearby Lincoln Park South Lagoon on Sunday. Michael Fernandez, 29, had gone into the lagoon after his dog a day earlier and did not resurface.

Rough conditions on Lake Michigan forced the Chicago Park District to put a swim ban in place at several beaches Sunday. The beach at 57th Street was closed along with most of the beaches in Rogers Park – North Shore Avenue, Helen Doria at Columbia Avenue, Tobey Prinz at Pratt Boulevard, Hartigan at Farwell Avenue, Loyola at Greenleaf Avenue, Marion Mahony Griffin at Jarvis Avenue, Howard Street, and Rogers Avenue.

In Rogers Park, Leone Beach at Touhy Avenue remained open with a swim advisory in place. Swim advisories were also issued for 12th Street, Calumet, Lane at Thorndale Avenue, Margaret T. Burroughs 31st Street, North Avenue, Oakwood, Foster Avenue, Ohio Street, Oak Street, and Osterman at Ardmore-Hollywood.