Stephen Hemsley will also get additional personal security benefits following the December murder of UnitedHealth’s top insurance executive.

The move comes five months after one of the company’s top executives was killed after being shot as he walked to an investor conference in

UnitedHealth Group shares rebounded modestly Wednesday following yesterday's crash, with analysts from UBS, Oppenheimer, and Morgan Stanley leaving their ratings unchanged after the health insurer pulled its outlook and announced its CEO had stepped down.

Stephen Hemsley ran UnitedHealth Group for more than a decade. It's a different company after four years with Andrew Witty in charge.

May 13 (UPI) -- UnitedHealth Group announced Tuesday CEO Andrew Witty will step down, citing "personal reasons." Witty will leave the role of CEO and be replaced by Stephen J. Hemsley, effective immediately.

UnitedHealth Group faces a U.S. Department of Justice criminal investigation for potential Medicare fraud, as reported by the Wall Street Journal. This follows CEO Andrew Witty's unexpected departure and a suspended financial forecast due to rising medical costs,

UnitedHealth Group surprises investors with what its CEO said was an "unusual and unacceptable" quarterly earnings miss, and lowers its outlook for the full year due to higher-than-expected medical costs, sparking a more than 20% selloff in shares that reverberated across the sector.