Christin Ross, 18, and Tyrell Wade, 17, were shot near River Oaks Center Mall in Calumet City last week.
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The teens' classmates at Thornton Fractional North High School came together Thursday to memorialize Ross and Wade. They released balloons on the school's football field.
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Ross was inside the mall with her two brothers and a friend when there was some type of disagreement with another teen, said Christopher Ross, Christin's father.
As they were running out of the mall, someone fired shots from a car, striking Ross and Wade. They were rushed to the hospital, and both died several days later.
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Christopher Ross said Christin was looking forward to college. He said he's going to miss her sense of humor most.
"She was a riot, kind of like me," he said.
Ross hopes police will track down the person responsible for taking two young lives.
No one has been arrested in the fatal shooting.