A teenager hanged by a man obsessed with asphyxiating girls was failed by police and social services assigned to her killer after an earlier attack. | more… https://www.google.com/url?rct=j&sa=t&url=http://www.bbc.co.uk/news/uk-england-34465925&ct=ga&cd=CAIyHDQxMjEzYTNjZmYwOWZjYzQ6Y28udWs6ZW46R0I&usg=AFQjCNFEqeJDUPDVPGmjzHZn752DOHd6Mg