He's been the CEO of UnitedHealth Group for 3 years now. UnitedHealth Care is a subsidiary, their CEO was the one shot. Best I can tell they haven't announced a replacement yet.
I know the org intimately. This this exactly correct. Most of their business is B2B. UHC is actually a fairly small slice of the pie. They have literally dozens of CEOs. The one killed is the CEO of the healthcare insurance entity.