CVS Health CEO Karen Lynch steps down, replaced by David Joyner, after 19% stock plunge CBS NewsCVS Shares Fall After Earnings Warning, CEO Ouster The Wall Street JournalCVS shakeup: Stock tumbles on abrupt news that David Joyner will replace CEO Karen Lynch Fast Company‘I Need Your Help’: New CVS Health CEO Issues Plea to Employees BloombergCVS ousts CEO Karen Lynch, names Caremark head David Joyner as new chief The Boston Globe