A major development in the shooting death of a Cambridge child. At first investigators said the three-year-old child shot himself in an accident. Now, Cambridge police says a man has been arrested in the case. Police say 22-year-old Richard Lacroix of 609 South 10th Street in Cambridge has been charged with murder. No other details in the case have been released. Police are expected to hold a news conference and will release more details in the investigation. The child, Dylan Maust died on Saturday at Children"s Hospital in Columbus from a gunshot wound to the head.