Kroger's CEO Rodney McMullen abruptly resigned after an investigation into his 'personal conduct'

Core Points - Kroger has replaced its CEO Rodney McMullen following an investigation into personal conduct that was deemed inconsistent with the company's business ethics policy [1][5] - Ronald Sargent, a board member and former CEO of Staples, has been appointed as interim CEO and board chair while the company searches for a permanent replacement [2][5] - Mark Sutton will assume the role of lead independent director [3] Company Background - Kroger is the largest supermarket chain in the US by sales, operating grocery stores under various names, including Harris Teeter and Fry's [3] - The company is expected to report its fourth-quarter earnings on Thursday [3]