Vivian Gamor killed her 10-year-old son Antoine and three-year-old daughter Keniece Ogunkoya in January 2007. She bludgeoned Antoine to death with a hammer and suffocated Keniece with clingfilm, leaving her in a bin bag, before setting fire to her flat in Hackney and calling 999. The children had been living with their father and grandparents after Gamor was sectioned for serious mental illness in 2006. She killed them during an unsupervised...