CHICAGO (CBS) — Students at a north suburban high school were planning a special tribute to a classmate who died of cancer in the spring.

Hundreds of students, parents, and supporters at Warren Township High School in Gurnee planned a “gray out” at their first home game of the Blue Devils football season. They’ll all wear gray t-shirts in honor of Daniel Wang, who died of brain cancer in April.

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Even the football team will be in gray.

Senior Haley Brock said Daniel Wang was the light of Warren Township High School.

“I do not remember a day where Daniel wasn’t smiling, or he didn’t ask me if I was okay in the hallway if I looked upset, or he just didn’t say ‘hi’ to me with this overjoyed persona,” she said.

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Brock is one of the organizers of the DW Project, a student group designed to raise money for brain cancer research in Wang’s memory.

“Daniel meant everything to us,” she said.

Money raised by the sale of the gray Daniel Wang t-shirts – which say “Once a Blue Devil, Always a Blue Devil,” and feature his signature on the back – will be donated to Lurie Children’s Hospital’s Pediatric Brain Tumor Program.

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Wang, 17, had emergency surgery to remove a cancerous tumor on his brain when he was only 12 years old, and underwent extensive chemotherapy and radiation. He seemed to have recovered in December, but suffered a seizure at school in April, and died a week later.