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Nov
Heather Walker of Marblehead, who died in April of an aggressive brain tumor, was honored by the Boston Celtics this week. Walker worked as vice president of public relations for the team for years. The Celtics announced on Monday that they were renaming their media center in her honor. Walker was 52 when she died. Heather Walker with Paul Pierce years ago at the TD Garden. COURTESY PHOTO “Heather Walker meant everything,” Celtics forward Jaylen Brown said. “She was the person I worked with a lot…