Jessica Suarez, 21, was last seen jogging along Montrose Beach on February 25. Her vehicle was found parked on the lakefront.
On Sunday, her sister made a plea to whoever may have taken Suarez.
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I know you have a heart. I know that you have someone that you love very, very much. That's how we love our sister. Jessie, I know you are out there," she said.
Family members said police showed them surveillance video of Suarez jogging on the lakefront the morning she vanished.
She is described as a 5'5", 160-pound Hispanic woman with black hair, brown eyes and olive complexion, police said. She was last seen wearing a dark knit hat, white scarf and brown cloth coat.
Anyone with information should call Area North Special Victims Unit at (312) 744-8261.