Andrew Dixon, a former executive of British retail giant Tesco, says he has left troubled Nakumatt Supermarkets where he served as the chief marketing officer.
He was appointed to the key position in January this year amid a management shakeup.
"To all my followers this is to advise that I no longer work at Nakumatt," Mr Dixon said on Twitter via a handle that the Business Daily has verified belongs to him.
He has also updated his LinkedIn page to indicate that he had completed his assignment at Kenya's largest retailer.
The supermarket had sought to tap his past experience in the international retail sector as it eyed a new shareholder that would help take on its mounting debt.
An anticipated capital injection of Sh7.7 billion from an unnamed strategic investor fell through in March, leading to a crisis marked by product stockouts at its outlets, a pay spat with its staff and the closure of some branches.
Update: Mr Dixon confirmed his exit from the retailer in response to queries by the Business Daily.
"I can confirm I have left Nakumatt effective immediately," he said Tuesday morning.
He did not respond to queries regarding the reasons for his exit.
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