She was with a 14-year-old girl who was rescued by beachgoers who saw the girls struggling in an unguarded portion of Marquette Beach, according to the Indiana Dept. of Natural Resources. But the 9-year-old girl slipped under and couldn't be located.
Gary police said first responders formed a human chain to search for the younger girl while the Lake County Sheriff's Department helicopter searched overhead, eventually locating her.
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The 9-year-old girl was pulled from the lake and received CPR before she was taken to a nearby hospital, police said.
Indiana DNR officials said the girl was later pronounced dead at the hospital. Her name has not yet been released.
The 14-year-old girl was treated at the scene and released, IDNR said.
This is a breaking news story. Check back for updates.