Rodney McMullen has resigned from the CEO spot at Kroger following a company investigation into his personal conduct.

Rodney McMullen is out as chairman and CEO of Kroger following an investigation into his "personal conduct" by the company's board of directors.

Kroger issued a statement that did not offer details of the investigation, but noted the conduct in question, while unrelated to the business, was inconsistent with the company's Policy on Business Ethics.

The board has appointed Lead Director Ronald Sargent as chairman and interim CEO, effective immediately. The board also announced that Mark Sutton will serve as Kroger's lead independent director, effective immediately.