(CNBC) – UnitedHealthcare on Thursday tapped company veteran Tim Noel as its new CEO following the targeted killing of its former top executive, Brian Thompson, in Manhattan in December.

Noel was the head of Medicare and retirement at UnitedHealthcare, the largest private health insurer in the U.S. It is the insurance arm of UnitedHealth Group, the nation’s biggest health-care conglomerate based on revenue and its more than $480 billion market cap. (Read More)