NEW YORK, May 7 (Reuters) - UnitedHealth Group (UNH.N) , opens new tab was sued on Wednesday for allegedly concealing how backlash from the killing of a top executive was damaging its business, causing its stock to nosedive after the insurer lowered its 2025 outlook.

In a proposed class action filed in Manhattan federal court, shareholders said the insurer defrauded them after the December 4 shooting of UnitedHealthcare Chief Executive Brian Thompson by shifting away from strategies that led to higher-than-average claims denials, without revealing the impact on profitability.