A woman who was poisoned by a military-grade nerve agent in southwest England died Sunday, eight days after police think she touched a contaminated item that has not been found. London’s Metropolitan Police force said the case had become a homicide investigation now that 44-year-old Dawn Sturgess had died in a hospital in Salisbury. She and her boyfriend, Charlie Rowley, 45, were admitted June 30 and remained in critical condition. CBC