Mass. man arraigned in 4 relatives' slayings By DENISE LAVOIE 2010-06-18T22:14:37Z WOBURN, Mass. (AP) -- A man accused of killing his wife, two children and mother-in-law in their suburban Boston home pleaded not guilty Friday as his lawyer said he may use an insanity defense.... © 2010 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.