Kroger board member Ron Sargent is taking the helm at the nation’s largest supermarket chain as questions about former CEO Rodney Mullen continue.

Kroger announced the resignation of CEO Rodney McMullen, citing issues related to his personal conduct. Sign up for our Newsletters The board of directors started an investigation last month. Company officials have not said what kind of personal conduct led to McMullen's resignation,

In the wake of Kroger CEO Rodney McMullen’s resignation following a board investigation of his personal conduct that was unrelated to the business but was inconsistent with the company’s policy on business ethics, the grocery giant has turned to a retail veteran to provide leadership.