I know it has already been posted, but as so often without sufficient explanation.
The CEO of United Healthcare was shot. However, it is important to emphasize that he is not the CEO of United Health Group $UNH (+1,64%) is. That's his boss Andrew Witty.
It is definitely extremely sad and a tragedy, but it does not affect the shareholders of the company, but first and foremost the family and friends of the deceased.
The police are certain that it was a targeted assassination. However, the exact reasons why he, of all people, was the target of a murder are still unknown.