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

He was certainly one of the smartest guys. I think he was one of the best guys. I’m going to miss him. And I am incredibly proud to call him my friend.”

Amid all that happened with the murder of UnitedHealthcare CEO Brian Thompson, the subsequent social media reaction, and the arrest of his alleged shooter, Luigi Mangione, a video footage of UnitedHea

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

UnitedHealth Group CEO Andrew Witty in his address to the company staff said their duty to prevent dubious health insurance claims would continue and that drew flak on social media after Brian Thompson's death and social media users openly called for Andrew Witty's killing and said he should be the next target.

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

Group CEO Andrew Witty now receiving threats after leaked internal company video shows him complaining about media coverage.

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.

In a Friday op-ed for the New York Times, Witty acknowledged that shortcomings exist in his industry. He called the "patchwork" health care system in the U.S. "flawed" and noted that the frustration of everyday Americans is understandable.

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.

Brian Thompson, who was praised for his significant contributions to the healthcare industry, was a key advocate for advancing UnitedHealth’s goals. Witty described Thompson as instrumental in improving the healthcare system and promised to honor his legacy.