A boater in a dinghy spotted a man's body floating in Lake Michigan's "Playpen" area on Saturday and alerted authorities.

The body was discovered around 4:30 p.m. as the Chicago Air and Water Show concluded. 

U.S. Coast Guard units monitoring the Playpen arrived at the scene first, and the Chicago Marine Police recovered the body. 

Lake Michigan's "Playpen"

A boater in a dinghy spotted a man's body floating in Lake Michigan's "Playpen" area on Saturday and alerted authorities. (Armando L. Sanchez/Chicago Tribune/Tribune News Service via Getty Images)

Spencer Williams, 29, was pronounced dead at the scene, the Cook County medical examiner’s office said.

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This is the third serious emergency at the Playpen in one week, the Chicago Tribune reported.

One person was left in critical condition on Wednesday after falling off a boat in the Playpen at around 7:30 p.m. that day. Officials are still looking for a second person.

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Boats parked in Lake Michigan's Playpen in Chicago

Spencer Williams, 29, was pronounced dead at the scene, the Cook County medical examiner’s office said. ( Taylor Glascock/Bloomberg via Getty Images)

And last Saturday, two women were severely injured in a boating accident when they were sucked into a boat’s propeller. One woman's feet were severed in the incident while the other lost part of her hand.

One of the women, 34-year-old Lana Batochi, was floating on an inflatable raft when a yacht went into reverse, sucking her raft into the propeller and cutting off her feet. She had to undergo a double leg amputation.

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Boat in Lake Michigan

Saturday's discovery marks the third serious emergency at the Playpen in one week. (AP Photo/Kiichiro Sato, File)

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Batochi said she felt "unimaginable pain" when the boat's propeller sliced her limbs.

"I thought I was dying," she said in the description of her GoFundMe page. "I fought for my life for seconds which felt like minutes. I began to drown, I couldn't swim. As soon as I had my head above the water, at a distance I saw my husband’s eyes searching for me in a panic. I would never forget his face of pain."