Andrew Witty reacted on Friday to the deluge of social media posts celebrating the Dec. 4 killing of Thompson in Midtown Manhattan.

"Brian was one of the good guys. He was certainly one of the smartest guys," Witty wrote. "I'm going to miss him."

In a New York Times opinion pieces, Witty made his first public comments since last week's fatal shooting of Thompson.

Andrew Witty, CEO of UnitedHealth Group, UnitedHealthcare's parent company, said he is "struggling to make sense" of Brian Thompson's murder

"No one would design a system like the one we have," UnitedHealth Group CEO Andrew Witty wrote in the New York Times.

Andrew Witty, the CEO of UnitedHealth Group Inc., called for health-industry reforms in a New York Times essay, his first public comments since the killing of one of his company's top executives.

Andrew Witty, the CEO of UnitedHealth Group, memorialized slain executive Brian Thompson in an op-ed and acknowledged industry flaws.

UnitedHealth Group CEO Andrew Witty wrote in an op-ed that the company wants to continue to push for health care industry reforms following the murder of UnitedHealthcare CEO Brian Thompson.

UnitedHealth Group CEO Andrew Witty mourned the killing of executive Brian Thompson and said he understood public frustrations with the “flawed” U.S. healthcare system. “No one would design a system like the one we have. And no one did. It’s a ...

UnitedHealth Group CEO Andrew Witty wrote in a New York Times opinion piece on Friday that the healthcare system was flawed and was a "patchwork built over decades." In the NYT article, Witty mourned the killing of Brian Thompson,

UnitedHealthcare's CEO in an op-ed published Friday praised Brian Thompson, who was murdered in New York City earlier this month, for his approach to the business at a time when the industry is under intense scrutiny.

UnitedHealth Group CEO Andrew Witty conceded the U.S. health care system is flawed, addressing for the first time the murder of top executive Brian Thompson.