Myra Latimer-Nicholas is a member of what she calls a crappy club, one of the mothers who have lost a child to gun violence whose cases have gone years unsolved. That changed early Tuesday, at least in part, when Latimer-Nicholas learned that a Boston man had been indicted in the 2011 shooting death of her oldest son, Steven Latimer. Assistant Attorney General Jim Baum delivered the news to her Tuesday morning along with Providence Police Detective Angelo A’Vant and Ana Giron, director of victims’ services at the attorney general’s office. “It was just really overwhelming,” Latimer-Nicholas said. “I honestly had not expected them to be where they were.”