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 CEO Rodney McMullen is resigning following a probe into his personal conduct, the grocery chain said Monday. McMullen, who was both the chairman and CEO, is out after a company board investigation found that his personal conduct,

Kroger CEO Rodney McMullen resigns following an inquiry into his conduct deemed inconsistent with company standards.

Mark Sutton named lead independent director immediately. Kroger CEO Rodney McMullen has resigned from the grocery giant 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.

Kroger announced Monday CEO Rodney McMullen has resigned following "a board investigation of his personal conduct." Lead Director Ronald “Ron” Sargent has been appointed interim CEO, effective immediately. Kroger said McMullen's conduct was "unrelated to the business," but "was inconsistent with Kroger’s policy on business ethics."

Rodney McMullen, Kroger chairman and CEO, is stepping down after an internal investigation into his personal conduct.

Kroger CEO Rodney McMullen is resigning immediately from the grocery store chain following an investigation that found his personal conduct was “inconsistent” with the company’s ethics policies.

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,