Karalynn Ashley McNicholas was found dead on May 11 outside of a home in the 6000 block of South Maplewood Avenue. Her family had reported her missing after the friend she was supposed to meet with said she never showed up.
The teen's purse and cell phone were missing, as well as her car, a 2014 silver Kia Sorento with the license plate AC54906.
No one is in custody.
McNicholas' cousin, Kylie McNicholas spoke to WGN about and said the family hopes they can get some sort of answer soon.
"It's been an extremely long three months," she said. "Our family is just sticking together, trying to get through this together."