The CEO of UnitedHealth Group has defended its role in America's health system as the company posted its first earnings results since the murder of one of its top executives. Sir Andrew Witty spoke to analysts as the firm reported mixed results,

The CEO of UnitedHealth Group defended the company's role in the U.S. health care system days after a report said the company made huge profits by significantly marking up the cost of lifesaving drugs.

The CEO of UnitedHealth Group said Thursday that shortcomings of America’s health care system must be addressed.

The UnitedHealth Group leader whose murder in December unleashed a torrent of public frustration and dissatisfaction with the U.S. health care system was pushing for some of the very improvements that critics have been seeking.