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DANVERS: Danvers High math teachers Sarah Giaquinta, left, and Julie Glynn, along with math teacher Jeff Avigian (not shown) plant a tree in memory of their slain colleague, math teacher Colleen Ritzer, during an Arbor Day ceremony at the school yesterday. The DPW Forestry Division and the Danvers Garden Club arranged for three pink dogwoods to be planted near the school's front driveway. Ethan Forman, staff photographer May 2, 2014