Gov. Charlie Baker joined Mayor Mary Walsh and members of Martin Richard's family Saturday to open Martin's Park.
The park features an accessible playground, including a replica of a boat, a water play garden and open space.
Martin was one of three people killed when two bombs exploded at the finish line. His younger sister Jane lost a leg.
During Saturday's ceremony, Jane sang "A Million Dreams," from the film "The Greatest Showman."
Martin's father, Bill Richard, said in a statement that the park is a "symbol of the commitment of so many individuals and their dedication to building a more kind, just, and inclusive community here."
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