6-year-old Kelly was last seen walking to school on January 8, 1980 in her hometown of Chicago, Illinois.
Kelly's school was a few blocks from her house in the South Shore Neighborhood, but she never made it to school and hasn't been seen since.
There was an accused murderer that confessed to killing Kelly and a few other missing girls & women in 1992, but it wasn't true and he was ruled out as a suspect. It's believed that she was abducted by a non-family member.
Kelly was last seen wearing a brown and white striped cap, brown scarf, red plaid coat, blue jeans and blue rubber boots. She also has a birthmark on her left side of her chest.