TEWKSBURY, Mass. —

An attempt at mediating the bitter dispute between Market Basket's Board of Directors and CEO Arthur T. Demoulas collapsed over the past week, resulting in the board's vote to remove the company's longtime leader.

In a statement, Board Chair Jay Hachigian said the vote on Tuesday to remove Demoulas was unanimous. Latest Forecast

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CEO Arthur T. Demoulas was placed on leave in May when the board accused him of planning a retaliatory work stoppage and hired a law firm to investigate. Since then, the fight has repeatedly leaked into public view.

Last month, longtime board member Bill Shea was removed shortly before an attorney representing the remaining members accused him of cooperating with the public relations

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