Police believe the gunman who killed UnitedHealthcare's CEO quickly left NYC on a bus after shooting
Police in New York City say they believe the suspect has left the city, but today found a backpack he'd left behind in Central Park.
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Thompson has served as CEO for more than three years and had been with the company since 2004.
Investigators have suggested the gunman may have been a disgruntled employee or client of the insurer.
