Wisconsin officials open investigation into police killing of Corey Ruiz

Officials in the US state of Wisconsin have opened a homicide investigation into the fatal shooting of a man by a police officer. The police chief in Madison, Wisconsin, told reporters on Thursday that he would cooperate with state investigators. "We will not hide from any aspect of this investigation," John Patterson said. Police have said that Corey Ruiz, 38, was shot on Wednesday after he pulled out a knife during a struggle with four officers. Bystander footage of the incident has circulated on social media and has sparked protests. Madison Mayor Satya Rhodes-Conway said the shooting will be "rigorously investigated." "It does not matter who you are or what your past is; you should not lose your life as a result of an encounter with law enforcement," she said. According to public records reviewed by US media, Ruiz had a history of misdemeanour and felony convictions including robbery by force, strangulation and drug possession. Police Chief Patterson said the state Justice Department's Criminal Investigation Division would investigate the shooting, since the incident involved its officers. They will also release the name of the officer who fired their weapon. Civil rights lawye