CHICAGO (CBS) — A 25-year-old woman drowned, and a 4-year-old boy is fighting for his life following rescues in Lake Michigan.

Gary Police say a woman disappeared after walking into the water at Marquette Beach in her street clothes.

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Gary police and fire department divers searched for two hours before pulling her dead from the water.

This drowning comes four days after 4-year-old Matthew Ramirez was spotted face-down in Lake Michigan at Warren Dunes State Park. Ramirez was rushed to a Kalamazoo hospital, where CPR restored his breathing.

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Neither area had lifeguards on duty.

The Great Lakes Surf Rescue Project’s Dave Benjamin says there are fewer shallow sand bar areas this summer.

“There could be drop-offs. A child could just step in water over their head and, if they’re a non-swimmer, they go right under without a sound,” he said.

Benjamin advises hands-on supervision, as well as life vests for children, even if they swim well.

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New Buffalo Police rescued a kayaker who fell into the lake and could not get himself out.