Albertsons said on Monday that its CEO Vivek Sankaran would be retiring and insider Susan Morris would assume the role, effective May 1.

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

Under his leadership, Kroger has positioned itself as a formidable competitor to Walmart, Amazon, and other grocery giants.

The conduct is not related to financial performance, operations or reporting, and it did not involve any Kroger associates, the company said.

Albertsons, the parent company of Safeway, will soon have a new CEO who’s grocery career began in Denver. The company’s Chief Operating Officer Susan Morris will succeed Albertsons’ current CEO Vivek Sankaran, the grocer announced Monday. Sankaran plans to retire and Morris will take over May 1, Albertsons said in a news release.

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

Kroger ( KR) is now at a crossroads: As CEO Rodney McMullen announced his resignation, same-store sale growth lagged behind competition and its proposed merger with Albertsons fell through.

Kroger Chairman and CEO Rodney McMullen has resigned after an internal investigation into his personal conduct. Kroger, the nation’s largest grocery chain, said Monday that the investigation into McMullen’s personal conduct was unrelated to the business,

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