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Major League Baseball management has fired Shyam Das, the arbitrator who overturned Ryan Braun's drug suspension in February.

MLB informed Das and the players' association of its decision last week. Das had been baseball's permanent arbitrator since 1999, part of what technically is a three-man panel that also includes a representative of management and labor.

"Shyam is the longest-tenured panel chair in our bargaining relationship," union head Michael Weiner said. "For 13 years, from the beginning to the end of his tenure, he served the parties with professionalism and distinction."

Baseball's collective bargaining agreement says the arbitrator can be removed by the players' association or management at any time with written notice.

"I had the distinct privilege to serve as chair of the MLB-MLBPA arbitration panel for almost 13 years," Das wrote in an email to The Associated Press. "I have the greatest respect for the representatives of both parties I worked with during that period, and I wish the parties well in their ongoing relationship."

The sides will now try to select a successor. If they cannot agree, baseball's collective bargaining agreement calls for them to ask the American Arbitration Association for a list of "prominent, professional arbitrators." The sides would then alternate striking names from the list until one remains.

Das, a graduate of Harvard and Yale University Law School, also has been an arbitrator for the NFL since 2004 and is scheduled to hear a grievance in the New Orleans Saints bounty case on Wednesday.

The baseball situation, "does not impact his role at an arbitrator for our CBA," NFL spokesman Greg Aiello said.

Following a grievance hearing, Das decided in February to overturn the 50-game suspension of Braun for a positive drug test. Lawyers for the Milwaukee outfielder, the reigning NL MVP, argued that the collection procedures specified in baseball's drug agreement for the urine sample were not followed with Braun's sample last Oct. 1 because it was not immediately left at a Federal Express office.

The collector testified that because the sample was taken on a Saturday and could not have been shipped that day to the testing laboratory outside Montreal, he concluded the sample would be more secure at his home. He then took it to a FedEx office on the following Monday.

Baseball's drug agreement states that "absent unusual circumstances, the specimens should be sent by FedEx to the laboratory on the same day they are collected."

Management loudly and publicly disagreed with his decision.

The sides asked Das to hold off on issuing a written decision while they negotiated changes to the drug agreement.

The 100-game suspension of Colorado Rockies catcher Eliezer Alfonzo for a second positive test, announced last Sept. 14, has been dropped because of the same procedural issues that came up in the Ryan Braun case. At the time the ban was announced, Alfonzo issued a statement saying he was surprised and had not taken any prohibited substances since 2008, when he served a 50-game ban while with San Francisco.

Alfonzo was designated for assignment by the Rockies on May 7 and sent outright to Triple-A Colorado Springs in the Pacific Coast League two days later.

Das took over as baseball's permanent arbitrator from Cornell professor Dana Eischen, who was hired in December 1997 but quit after ruling the following May against J.D. Drew's grievance seeking free agency.

Many of baseball's grievance arbitrators have had brief tenures, with the list including Lewis Gill (1970-72), Gabriel Alexander (1972-74), Peter Seitz (1974-75), Alexander Porter (1977-79), Raymond Goetz (1979-83), Richard Bloch (1983-85), Thomas Roberts (1985-86), George Nicolau (1986-95), Nicholas Zumas (1995-97) and Eischen (1997-98).

Joseph Sickles heard one case in 1976, and temporary arbitrators were used between Eischen and Das.

Seitz was fired after he ruled against owners in the Andy Messersmith-Dave McNally reserve clause case that led to free agency. Roberts was fired after deciding management colluded against free agents between the 1985 and 1986 seasons.

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AP Pro Football Writer Barry Wilner and AP Sports Writer Mike Fitzpatrick contributed to this report.