These ten cases of homicide (murder and manslaughter) in London in 2010 remain unsolved. Can you help? Call Crimestoppers anonymously on 0800 555 111. Sukhwinder Singh, a 31-year-old builder, was stabbed in the heart after trying to stop robbers stealing a woman’s handbag. On 8 January 2010 he chased two muggers who attacked a 28 year-old …