Liebherr oversaw the purchase of the south coast club in July last of year. He helped to take the League One side out of administration, but the Swiss oligarch was powerless to prevent the club from receiving the enforced ten-point deduction.
Last season ended in glory for Southampton as they triumphed in the Johnstone’s Paint Trophy.
A Southampton statement read: “His passing will come as an enormous shock to everyone but most particularly, of course, to his family and wide circle of friends. Our thoughts are with them at this very difficult time.
“Anyone who came to know Markus learned of his quick wit, love of football – most especially Saints football – and his unquenchable thirst for better knowledge of all things.
“Anyone who had the privilege of meeting Markus met a man who was quiet, unassuming, undemonstrative and fantastic fun to be with. To say he will be missed is an unmistakable understatement.
“What would Markus want now is a question that will be on everyone’s lips.
“He would have wanted to be there when the Saints get promotion to the Premier League. The well laid plans for the Club that he and the Executive Chairman had mapped out over a year ago will continue to be implemented uninterrupted and nothing will change in that regard.
“The club will ensure that Markus’ wishes are carried out in full.”
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