"I'm done ... whatever you want to call it," he told Fancred Sports.
Werth, 39, signed with the Seattle Mariners after being made a free agent by the Nationals in November 2017. He had been playing with Triple-A Tacoma when he made the decision to retire.
Werth was a member of the Philadelphia Phillies 2008 World Series team and was an All-Star in 2009, setting career highs with 36 home runs and 99 RBIs.
In 2011 he signed a seven-year, $126 million contract with the Nationals. Many criticized the deal as being excessive for the 32-year-old. However, Werth's time with the Nats coincided with the team going from bottom dweller to contender.
Werth finishes his 15-year career as a .267 hitter with 229 home runs and 799 RBIs.
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Information from ESPN was used in this post.
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