CVS Health is looking for a new chief digital officer.

Brian Tilzer, who joined CVS in 2013 as the drug store chain and health services company first chief digital officer, left CVS about a month ago to assume a new post as chief digital and technology officer for Best Buy Inc. in Minneapolis.

CVS has yet to say publicly that Tilzer has left. CVS also has yet to name a replacement or if the position will be filled in the wake of CVS’ planned takeover of healthcare insurer Aetna Inc.

But Tilzer does have his new Best Buy position updated on his LinkedIn profile. Tilzer has a long history in online retailing. He joined CVS from Staples, an office supplies and services retail chain, where he served as senior vice president of global e-commerce for three years,

At CVS Tilzer was responsible for digital strategy, technology and the digital business lines across all of CVS Health. Those duties included digital product management, user experience design, digital technology and operations, and omnichannel customer experience across CVS Health’s retail pharmacy, Caremark, CVS Specialty and Minute Clinic businesses. He also was in charge of advanced analytics.

CVS had a large and growing e-commerce channel—especially for its core retail pharmacy business. For example, more than 18.8 million people have enrolled in text messaging and in recent years CVS has sent 300 million prescription text messages reminders to customers and generated 13 million mobile visits per month, accounting for 3 million weekly visits on average.

Tilzer left CVS at a time when CVS Health is moving forward with its planned acquisition of Aetna. On Dec. 3, CVS announced it would buy Aetna for about $67.5 billion and absorb about $10 billion in Aetna’s debt. The deal combines the largest U.S. drugstore chain with the third-biggest health insurer, rolling Aetna’s health insurance business in with CVS’s drug plans and retail operations. The deal was approved by both companies’ shareholders in March. The deal, which is still moving through a review by regulators, is expected to close in the back half of the year.

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