MOUNT AIRY, Md. — A home-improvement worker and school janitor who apparently was struggling to survive the recession killed his sleeping wife and two children before turning the 12-gauge shotgun on himself, Maryland State Police said Saturday. Charles L. Dalton, 38, left no suicide note and police haven’t clearly identified a motive for the murders, spokesman Greg Shipley said. “It is possible that financial difficulties were part of the motive,” he said. Police announced the findings one day after the bodies of Dalton, his wife Jennifer, 37, and their children Charles Jr., 14, and Emmaline, 7, were found in their...