There’s a shareholder lawsuit alleging fraud by UHC for failing to disclose that after Brian Thompson’s death, "it would have to adjust its strategy, which resulted in heightened denials compared to industry competitors." That’s not absolute proof, but it’s also not nothing.

UnitedHealth sued by investors over its response after CEO's killing
UnitedHealth Group is facing a class action lawsuit from investors, who allege the company misled them after the December killing of top executive Brian Thompson.