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In August 2000, 37-year-old Gregory Derringer was found fatally stabbed outside the Mount Vernon Square Metro station, in a plywood enclosure that sheltered the station entrance from the construction site of the new convention center. The never-solved murder led to a $20 million wrongful-death suit accusing Metro, the Washington Convention Center Authority, the District of Columbia, and two construction firms of creating unsafe conditions at the site. That case is still grinding through federal court. But on Feb. 24, Metro filed a suit of its own against the Convention Center Authority, arguing that the convention agency had agreed to protect the transit agency from construction-related lawsuits. Says Cal Steinmetz, an attorney for Derringer’s estate: “Metro doesn’t get out of a claim against them by saying, ‘We have a contract with someone else—it’s their fault.’” —David Morton