Family members confirm the body is of Devane Gross, 22, of Riverdale.
Gross was last seen in-person leaving her stepmother's Austin home after spending Halloween with family a few blocks away.
RELATED: Family desperate to find missing Riverdale woman last seen in Austin neighborhood day after Halloween
The next day, relatives say Gross last answered a call from her mom around 8 a.m. when she failed to return to her Riverdale home.
"She answered. She said, 'Oh mom, I'm at the lakefront. I'm just clearing my head.' But she also got a call from her stepsister who could actually see she was there at the lake," Gross' aunt Krista.
Her phone also last pinged near the Shedd Aquarium, according to family.
Chicago police say there is no sign of foul play.