Joe Girardi took over as manager of the Yankees in 2008, won a championship in just his second season in charge, and in the years that followed, some more successful than others, established himself as a relentless, highly organized field general. But now, after a decade in the job, Girardi’s tenure is over.

Girardi, who is 53, announced his departure in an emailed statement on Thursday morning, saying that he was disclosing with “a heavy heart” that “the Yankees have decided not to bring me back.” The statement went on to thank people including his coaches, the team’s ownership and General Manager Brian Cashman, and concluded with Girardi saying that the excitement of the 2017 postseason, in which the Yankees fell just short of the World Series, would “remain in my heart forever.”

In a separate statement issued by the Yankees, Cashman said that he wanted to thank Girardi “for his 10 years of hard work and service” and cited the intense effort he put into every game that he had managed. Still, Cashman added, the Yankees had concluded it was time to make a change.

The decision to replace Girardi, whose contract had expired, came after front-office meetings earlier this week at Yankee Stadium. On Wednesday, according to a person who is friends with Girardi, he cleaned out his office, packing up the college football helmets he has long had as keepsakes.