UnitedHealth Group announced a dramatic leadership shakeup, with former CEO and current chairman Stephen Hemsley stepping back into the top job following the abrupt resignation of Andrew Witty. The move comes at a time of escalating crises for the healthcare giant — including the recent fatal shooting of Brian Thompson,

The executive caused public outrage when he defended the insurance giant’s practice of denying health care claims.

Stephen J. Hemsley returned as CEO after Andrew Witty's surprising decision to leave the insurance giant, which has seen its stock plummet recently.