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Jessica Joy Rees, 12; wrote of battle with cancer

ana venegas/orange county register/file 2011

Jessica Joy Rees devised “Joy Jars.’’ Buyers got a T-shirt and filled them with “Joy’’ for others. Proceeds aided research.

RANCHO SANTA MARGARITA, Calif. - A 12-year-old Southern California girl who started a blog and a Facebook page to raise awareness about child cancer has died of a brain tumor.

Jessica Joy Rees was diagnosed in March. Her family said she died yesterday.

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The Orange County Register reported that Jessica was mourned by tens of thousands of people on Facebook.

On the blog, she wrote posts that described her feelings and urged readers to pray for children with cancer. The seventh-grader always signed off with the acronym “NEGU,’’ short for “never ever give up.’’ Jessica and her father, Erik Rees, also started a foundation to raise money for pediatric cancer research.

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