The UnitedHealth CEO abruptly stepped down on Tuesday, six months after the CEO of UnitedHealth's subsidiary UnitedHealthcare, Brian Thompson, was murdered.
Andrew Witty cited "personal reasons" for stepping down from the top position. He was replaced by Stephen J. Hemsley, who previously served as the CEO from 2006 to 2017. Hemsley will continue to serve concurrently as chairman of UnitedHealth's board of directors.