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

Kroger Co. replaced Chief Executive Officer Rodney McMullen following an investigation into his personal conduct, casting a shadow on the supermarket operator’s path forward following a failed deal and a string of management departures under the longtime leader.

Kroger CEO Rodney McMullen resigned from his post on Monday, weeks after a merger with Albertsons fell through.