Marlon Byrd suspended 50 games for doping, calls it an "inexcusable mistake"

In this May 30, 2012, file photo, Boston Red Sox center fielder Marlon Byrd dives to catch a fly ball by Detroit Tigers' Gerald Laird during a baseball game at Fenway Park in Boston. File,AP Photo/Elise Amendola

(CBS/AP) NEW YORK - Outfielder Marlon Byrd was suspended 50 games by Major League Baseball on Monday after testing positive for a performance-enhancing substance.

Major League Baseball said the 34-year-old Byrd tested positive for Tamoxifen, which can reduce side effects of steroid use and increase testosterone. It is often used to treat breast cancer patients.

"I made an inexcusable mistake," Byrd said in a statement released by the players' association. "Several years ago, I had surgery for a condition that was private and unrelated to baseball. Last winter, I suffered a recurrence of that condition and I was provided with a medication that resulted in my positive test. Although that medication is on the banned list, I absolutely did not use it for performance enhancement reasons."

Byrd is currently a free agent, and will be placed on the restricted list for the duration of his suspension, which began immediately. He started the season with the Cubs and was dealt to the Red Sox on April 21. He was designated for assignment by Boston on June 9 and released four days later.

"I am mortified by my carelessness and I apologize to everyone who loves this game as I do," Byrd said. "I will serve my suspension, continue to work hard and hope that I am given an opportunity to help a Club win later this season."

In 2009, Byrd said he was using supplements provided by SNAC System, a company founded by Victor Conte, who also was the founder of the Bay Area Laboratory Co-Operative.

BALCO was at the center of a wide-ranging scandal involving performance-enhancing drugs that enveloped several top-level athletes, including Marion Jones, Tim Montgomery and Barry Bonds. Conte pleaded guilty to steroid distribution in July 2005 and served four months in jail.

Byrd said the supplements were all OK to use under MLB rules. He had never before been suspended for failing an PED test.

Conte took to Twitter to deny giving Byrd anything illegal.

"I provided Marlon Byrd with nutritional and training advice which had nothing whatsoever to do with any type of prohibited substances," Conte added.

In an email to The Associated Press, Conte said he still supports Byrd.

"Marlon Byrd is a terrific person and did not use a drug to cheat," Conte said in his email. "Look at his numbers this season, the worst of his career. Traded and then cut. I was not aware of his medical condition. Marlon is my friend and I will always have his back."

Byrd hit .210 in 47 games with the two teams, though he hit .270 with a homer and seven RBIs in 34 games with Boston. The Red Sox picked him up when they had a shortage in the outfield after a rash of injuries.

>CBSSports.com's Matt Snyder notes that Byrd started out hitting .070/.149/.070 for the Cubs before being traded to the Red Sox, where he performed better (.270/.286/.320), but was released earlier this month.

"He played here and he played well," Red Sox manager Bobby Valentine said. "I had no indication or I don't think anyone did."

The 34-year-old Byrd has played for five teams in 11 major league seasons and is a career .278 hitter.

Byrd finished fourth in the National League Rookie of the Year voting in 2003 with the Phillies and was a National League All-Star with the Cubs in 2010.

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