Cincinnati-based grocer Kroger announced on Monday the abrupt resignation of its CEO Rodney McMullen, citing "personal conduct" that was inconsistent with company policy as the reason for his ousting.

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

The grocery chain said it had investigated its chief executive, Rodney McMullen, and found that his actions were “inconsistent” with its business ethics policy.