An unsolved murder in 1991 is being revisited by authorities for possible clues about the infamous art heist at Boston's Isabella Stewart Gardner Museum, reports Bob Ward for Boston 25 News. In the over three decades since thieves made off with treasured artworks valued then at $500 million, including a rare Vermeer and Rembrandt's only seascape, investigators have looked into the security guards, New England crime figures and others as culprits. The March 1990 heist of 13 still-missing ...