Casey Carl, Walmart's senior e-commerce executive, is retiring at the end of February after nearly two years, according to an internal message.

Tom Ward, Walmart's senior vice president of last-mile deliveries, will take Carl's post. Starting February 1, Ward's new title will be executive vice president and chief e-commerce officer.

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Carl is the most recent executive to leave the firm. Walmart's chief merchandising officer in the United States, Scott McCall, announced his retirement last week and was succeeded by groceries executive Charles Redfield. Walmart's former chief financial officer, Brett Biggs, left the business in late November.

Carl, Walmart's Chief Omni Strategy and eCommerce Officer were in charge of the company's omnichannel and e-commerce activities, which included grocery delivery, Walmart+, marketplace, and Store No8, Walmart's incubation arm.

In the memo, Walmart U.S. Chief Executive John Furner wrote, "Casey has been a dedicated advocate for our sellers and spearheaded the work to create and implement our seller value offer, which has led to substantial growth in our third-party Marketplace and Walmart Fulfillment Services." "Casey's contributions to Walmart's U.S. business have been much appreciated."

Jennifer Jackson, senior vice president of enterprise strategy, M&A, and strategic partnerships will now be in charge of the incubator.

Carl has also worked for Target for 20 years. During his time at Target, he was in charge of the company's innovation strategy, which included the development of new business models and platforms. He was also in charge of Target.com and omnichannel.

Walmart has put a lot of emphasis on e-commerce. The business announced earlier this month that it would add InHome, a grocery delivery service that allows drivers to enter clients' homes, to its e-commerce portfolio.