The suspected killer flew from O’Hare Airport to Heathrow Airport in London to flee the country, Chicago Police say. But his plan hit a snag when he told British authorities he intended to work there. They said no thanks and sent him back to the United States in January, police said. That’s when U.S. Immigration and Customs Enforcement officials at the airport in Newark, N.J., ran his name through a database and discovered he had been arrested in a murder in Chicago. It turned out that last year, Chicago Police detectives had questioned and released the man, Maurice Hudson, in...