UnitedHealth Group revealed on Tuesday that its CEO Andrew Witty is stepping down due to personal reasons. Witty would remain a senior advisor as he is replaced by former CEO and longtime company leader Stephen Hemsley, who has been board chair since 2017.

UnitedHealth has been hammered in a number of ways: increased costs, political pressure over its size, and scrutiny by the Federal Trade Commission and Department of Justice. Cong

The moves follows Brian Thompson's murder, sharp public criticism, and a major blow to the insurer's stock price.