The man who blew the whistle on milk contamination in China has been killed… Jiang Weisuo, 44, started to expose how milk was being contaminated in 2006, two years before the scandal that enveloped Sanlu, then a subsidiary of New Zealand dairy giant Fonterra. Jiang…died…after suffering two knife wounds… Xian Evening News reported. The newspaper cited an unidentified local police source who said Jiang had been stabbed by his wife…But…Beijing News…said Jiang's wife did not stab her husband…South China Morning Post said Jiang's prominence as a food safety critic has caused some media outlets to question whether his death was related to his efforts to clean up the industry…[Jiang's wife] had confessed to the crime, according to police. Jiang had faced great pressure after his whistleblowing in 2006…The melamine-tainted milk power resulted in the death of at least six babies and left 300,000 others ill in the country in 2008…