Waligwa’s death was announced on Sunday by Gayaza High School, an all-girls boarding school outside the Ugandan capital of Kampala where Waligwa had been a student.

“You were a darling to many and we have lost you to a brain tumor at such a tender age,” the high school said on Twitter.

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David Oyelowo, another of Nikita’s co-stars, wrote on Instagram: “She was a ball of light in Queen of Katwa and in life.”

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Waligwa had been diagnosed with a brain tumor in 2016 and seemed to recover from her ailment a year later. She received radiotherapy treatment in India as Uganda didn’t have the necessary equipment at the time and was told she was cancer-free at one point. But, in 2019, another tumor was found. Queen of Katwe director Mira Nair helped organize efforts to fund Waligwa’s treatment during filming, according to BBC.

It is a tragic and heartbreaking loss and my thoughts, prayers and well wishes go out to Nikita’s family as well as all the others whose lives were touched by this “sweet, warm, talented” and enormously beautiful soul.

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Rest well, Nikita.