UnitedHealth Group Inc. unexpectedly suspended earnings guidance and brought back Chairman and former CEO Stephen Hemsley for the top role, saying Andrew Witty has resigned “for personal reasons.” Cynthia Koons reports on Bloomberg Television. -------- More on Bloomberg Television and Markets Like this video? Subscribe and turn on notifications so you don't miss any videos from Bloomberg Markets & Finance: https://tinyurl.com/ysu5b8a9 Visit http://www.bloomberg.com for business news & analysis,