VIDEO: A local lawyer killed his wife and three young children in a murder-suicide that was discovered when firefighters responded to a blaze in their Berkshire County home Wednesday. Two 41-year-old adults and their children, a set of 7-year-old twins and a 3-year-old, were found dead after firefighters extinguished the blaze at 1343 Home Road in Sheffield, Berkshire District Attorney Andrea Harrington said at a press conference Thursday. Harrington identified the victims as Justine Wilbur and her husband, Luke Karpinski. She did not release the names of the children. Sources said the children are Alex and Zoe, both 7, and Marek, 3. “We are investigating this matter as a murder-suicide. At this time, the evidence indicates that Luke Karpinski was the assailant,” Harrington said.