Agent: Chicago Marathon champion fails doping test

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STELLENBOSCH, South Africa (AP) -- Chicago Marathon champion Rita Jeptoo failed a doping test in September, the Kenyan runner's agent said Friday.

Federico Rosa told The Associated Press that Jeptoo tested positive for a banned substance in an out-of-competition test in Kenya weeks before she won a second straight Chicago Marathon title on Oct. 12.

"This is true," Rosa said in a telephone interview.

Rosa said Jeptoo's "A" sample had tested positive and they were waiting for her backup "B" sample to be tested. Rosa declined to name the substance.

Rosa said he had learned of the positive test "a few days ago."

"We will legally go after the person or the people that convinced Rita to do this," Rosa said, adding Jeptoo's management had "nothing to do with" any doping. "I am sorry for Rita."

The 33-year-old Jeptoo has won back-to-back titles at the both the Chicago and Boston Marathons and leads the World Marathon Majors series.

The series said earlier Friday that it had postponed Sunday's awards ceremony because of the positive test.

"No athlete can win the World Marathon Majors Series title who has been in breach of IAAF anti-doping rules," the series said.

The IAAF said in a statement that it was "not in position where it can confirm or deny" Jeptoo's positive doping test.

"The case remains in the confidentiality phase," the IAAF said, "although that should be lifted within the next week."

Jeptoo's failed doping test comes as Kenya is under close scrutiny for a recent spike in doping cases.

A report into doping in Kenya was released this month. The investigation found that the East African country has problems with athletes from a number of sports using banned substances.

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NYC Marathon through the years
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Agent: Chicago Marathon champion fails doping test
With his tongue hanging out of his mouth, Bill Rodgers of Melrose, Mass., crosses the finish line to win the 1976 New York City marathon, Sunday, Oct. 24, 1976. "This was ideal weather for me," said Rodgers, who finished a disappointing 40th at the Montreal Olympic Games. The marathon was run in cool uper forty and lower fifty degree temperatures. (AP photo/str/lw)
More than 11,000 runners leave the starting line in Staten Island for the running of the 26-mile New York City Marathon, Sunday, Oct. 22, 1978. Bill Rodgers, maintaining a torrid pace despite unseasonable heat, won the marathon for the third consecutive year, while Grete Waitz of Norway ran the fastest time ever in the women's division. (AP Photo/Carlos Rene Perez)
Crowds of runners run across the Verrazano-Narrows Bridge at the beginning of the New York City Marathon, New York City, October 21, 1979. (Photo by Barton Silverman/New York Times Co./Getty Images)
UNITED STATES - OCTOBER 24: New York City Marathon runners and Fred Lebow looking over the Marathon route on a map. (Photo by Pat Carroll/NY Daily News Archive via Getty Images)
UNITED STATES - OCTOBER 23: Rod Dixon at the finish line of the New York City Marathon after winning the race. (Photo by Harry Hamburg/NY Daily News Archive via Getty Images)
Some 16 000 runners cross the Verrazano-Narrows bridge at the start of the 1981 New York city Marathon, on October 25, 1981 during the 12th annual running of the event. (Photo credit should read -/AFP/GettyImages)
New York City Marathon legless marathon runner Bob Wieland on First Ave. (Photo By: David Handschuh/NY Daily News via Getty Images)
Protected spectators give moral support of a wet marathon runner as he crosses the Pulaski Bridge from Brooklyn to Queens during the New York City Marathon, Sunday, Oct. 23, 1983, New York. (AP Photo/Tom Middlemiss)
Grete Waitz, second from left, runs along First Avenue in the Manhattan section of New York, Oct. 28, 1984, during the New York City Marathon. Waitz, a five-time winner and defending women's champion of the marathon, went on to win the women's division with an unofficial time of 2:29:30. (AP Photo/Debbie Hodgson)
NEW YORK, NY - NOVEMBER 06: Grete Waitz #F4 of Norway runs on 1st Avenue in Manhattan on her way to winning the 1988 New York City marathon held on November 6, 1988 in New York City. (Photo by David Madison/Getty Images)
NEW YORK, NY - NOVEMBER 1: Runners cross the Verrazano-Narrows Bridge at the start of the 1992 New York City Marathon 01 November 1992. More than 25,000 runners participated in the 26-mile race over the city's five boroughs. (Photo credit should read HAI DO/AFP/Getty Images)
Participants in the 27th running of the New York City Marathon cross the Pulaski Bridge in the Queens borough of New York, with the Manhattan skyline in the background, Sunday, Nov. 3, 1996. (AP Photo/Todd Plitt)
An unidentified marathon watcher views participants of the 27th New York City Marathon from a rooftop on Fourth Avenue in the Brooklyn borough of New York, Sunday, Nov. 3, 1996. Italy's Giacomo Leone won the New York City Marathon with a time of 2:09:54. (AP Photo/Santaigo Ochoa)
Runners competing in the New York City Marathon run along Brooklyn's 4th Ave., Sunday, Nov. 2, 1997, in New York. Kenya's John Kagwe, running the last couple of miles with a loose shoelace, won the marathon in a near-record time of 2:08:12. Franziska Rochat-Moser, the first runner from Switzerland to capture a major marathon, won the women's division in 2:28:43.(AP Photo/Adam Nadel)
Duster, left, and Jim Reynolds watch runners competing in the New York City Marathon along Brooklyn's 4th Ave. on Sunday, Nov. 2, 1997, in New York. A record 32,500 runners are expected to start New York's 28th annual marathon. (AP Photo/Adam Nadel)
UNITED STATES - NOVEMBER 04: Runners are a blur during the New York City Marathon. (Photo by Susan Watts/NY Daily News Archive via Getty Images)
1 Nov 1998: General view of debris after start of the New York City Marathon in New York City, New York. Mandatory Credit: Elsa Hasch /Allsport
1 Nov 1998: German Silva of Mexico gets assistance after finishing fourth in the New York City Marathon in New York City, New York. Mandatory Credit: Elsa Hasch /Allsport
NEW YORK CITY, UNITED STATES: Runners on Bedford Avenue in Brooklyn pass an intersection with the skyline of lower Manhattan visible in the background in the 1999 New York City Marathon 07 November 1999. Over 25,000 runners competed in the 30th running of the marathon. AFP PHOTO/Tom MIHALEK (Photo credit should read TOM MIHALEK/AFP/Getty Images)
7 Nov 1999: A view of the pack of racers during the New York City Marathon in New York, New York. Mandatory Credit: Jamie Squire /Allsport
7 Nov 1999: A view of runners passing through Central Park during the New York City Marathon in New York, New York. Mandatory Credit: Jamie Squire /Allsport
396848 09: New York City firefighters from Ladder 16 (Top) cheer on runners as they pass through Manhattan November 4, 2001 during the 32nd New York City Marathon. (Photo by Mario Tama/Getty Images)
396848 02: Roslyn Katz cheers on runners as they pass through Queens during the 32nd New York City Marathon November 4, 2001. (Photo by Mario Tama/Getty Images)
396848 07: A group of runners passes through Queens during the 32nd New York City Marathon November 4, 2001. (Photo by Mario Tama/Getty Images)
A runner carries an American flag as he crosses the Pulaski Bridge in the Queens borough of New York during the 32nd running of the New York City Marathon Sunday, Nov. 4, 2001. The Manhattan skyline is visible in the background. (AP Photo/Louis Lanzano)
Runners stream off the Verrazano Narrows Bridge into the Brooklyn borough of New York during the start of the New York City Marathon Sunday, Nov. 2, 2003, in New York. (AP Photo/Julie Jacobson)
With the Manhattan skyline in the background, the elite male runners run up 23rd Street in the Queens borough of New York in the New York City Marathon, Sunday Nov. 2, 2003. (AP Photo/Mary Altaffer)
NEW YORK - NOVEMBER 7: Runners stream over the Verrazano Narrows Bridge at the start of the New York City Marathon November 7, 2004 in the Brooklyn borough of New York City. Nearly 35,000 runners participated in this year's marathon. (Photo by Spencer Platt/Getty Images)
NEW YORK - NOVEMBER 7: Runners rest before the start of the New York City Marathon November 7, 2004 in the Staten Island borough of New York City. Nearly 35,000 runners participated in this year's marathon. (Photo by Spencer Platt/Getty Images)
New York, UNITED STATES: Runners come across the Queensborough Bridge on their way to the finish of the 35th New York City Marathon 06 November 2005. World record holder Paul Tergat of Kenya won the race in 2hr 09min 31sec. AFP PHOTO/Timothy A. CLARY (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)
NEW YORK - NOVEMBER 05: Competitors at the bottom end of the field run through masses of discarded drink containers on First Avenue in the 37th ING New York City Marathon on November 5, 2006 in New York City. (Photo by Chris McGrath/Getty Images)
Participants in the 35th running of the New York City Marathon cross half way mark and the Pulaski Bridge into the Queens borough of New York with the Manhattan skyline in the background, Sunday, Nov. 7, 2004. (AP Photo/Mary Altaffer)
Christina Ripp, left, of the United States and Edith Hunkeler of Switzerland react after crossing the finish line for second and first places in the womens' wheelchair division of the New York City Marathon Sunday, Nov. 6, 2005, in New York's Central Park. (AP Photo/Kathy Willens)
Runners start the New York City Marathon in the Staten Island Borough of New York, Sunday, Nov. 6, 2005. (AP Photo/Frank Franklin II)
Runners receive sponges on the course of the New York City Marathon in New York, Sunday, Nov.6, 2005. (AP Photo/Shiho Fukada)
Runners exit the Queensboro bridge during the New York City Marathon, Sunday, Nov. 4, 2007 in New York. (AP Photo/Ed Betz)
NEW YORK - NOVEMBER 04: Competitors grab water from a drink station as they run down First Avenue during the 2007 New York City Marathon on November 4, 2007 in New York City. (Photo by Chris McGrath/Getty Images)
Lance Armstrong (C), who retired from cycling after winning an unprecedented seven straight Tour de France, crosses the finish line of the New York City Marathon in New York 04 November 2007. AFP PHOTO/TIMOTHY A. CLARY (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)
Runners walk past piles of blankets as they finish the New York City Marathon in New York 04 November 2007. AFP PHOTO/TIMOTHY A. CLARY (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)
NEW YORK - NOVEMBER 02: Runners make their way down Fifth Avenue during the 2008 New York City Marathon on November 2, 2008 in New York City. (Photo by Jarrett Baker/Getty Images)
Marcus Garcia, 41, of the Brooklyn borough of New York, greets runners exiting the borough before passing over the Pulaski Bridge to the Queens borough of New York during the New York City marathon Sunday Nov. 1, 2009. He intentionally misspelled "Brooklyn". (AP Photo/David Goldman)
Leading runners compete in the Ne York City Marathon on November 1, 2009 in New York City. Meb Keflezighi, of the US, the 2004 Olympic silver medalist, earned his first major marathon with a time of 2hr 09min 15sec. The 34-year-old athlete was born in Eritrea, and became a US citizen in 1998. AFP PHOTO/Emmanuel Dunand (Photo credit should read EMMANUEL DUNAND/AFP/Getty Images)
Edith Hunkeler of Switzerland (R) and Wakako Tsushida of Japan embrace after finishing in the wheelchair division of the New York City Marathon November 1, 2009 in New York. Hunkeler finished first and Tsushida finished in third. AFP PHOTO/DON EMMERT (Photo credit should read DON EMMERT/AFP/Getty Images)
Ethiopian Gebre Gebremariam (R) powers his way to win the New York City Marathon in a time of 2:08.14 ahead of Kenya's Emmanuel Mutai, in New York, November 7, 2010. Kenya's Moses Kigen Kipkosgei finished third. AFP PHOTO/Emmanuel Dunand (Photo credit should read EMMANUEL DUNAND/AFP/Getty Images)
NEW YORK. NY - NOVEMBER 06: (EDITORS NOTE: Image was created using a variable planed lens.) Runners cross the Verrazano-Narrows Bridge towards Brooklyn at the start of the ING New York City Marathon as seen from the air on November 6, 2011 in New York City. (Photo by Chris Trotman/Getty Images)
Runners make their way up 1st Avenue in Manhattan during the 2011 ING New York City Marathon in New York November 6, 2011. The 26.2 mile marathon course is through the five bouroughs of New York City and is one of the largest in the world. AFP PHOTO TIMOTHY A. CLARY (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)
Cesar Carrasco, 44, a soldier from Chile participates in the 'Run Anyway NYC Marathon' taking place in Central Park on November 4, 2012 in New York, New York. The 'Run Anyway Marathon' takes place after the ING New York City Marathon was canceled as New York recovers from Hurricane Sandy. AFP PHOTO/Mehdi Taamallah (Photo credit should read MEHDI TAAMALLAH/AFP/Getty Images)
Runners participate in the 'Run Anyway NYC Marathon' taking place in Central Park on November 4, 2012 in New York, New York. The 'Run Anyway Marathon' takes place after the ING New York City Marathon was canceled as New York recovers from Hurricane Sandy. AFP PHOTO/Mehdi Taamallah (Photo credit should read MEHDI TAAMALLAH/AFP/Getty Images)
NEW YORK, NY NOVEMBER 3 : Visitors cheer as runners participate in the 2013 ING New York City Marathon which is 26.2 mile on November 3, 2013 in New York City. Geoffrey Mutai won the mens contest after finishing in 2 hours, 8 minutes and 24 seconds. It was his second win in a row since he won in 2011 and last year's marathon was postponed due to hurricane Sandy.In the women's contest, Kenyan Priscah Jeptoo won after finishing in 2:25:07.The winners won half a million dollars each. (Photo by Cem Ozdel/Anadolu Agency/Getty Images)
Runners race in the New York City Marathon on November 3, 2013. One of the most famous marathons in the world, canceled at the last minute in 2012 because of Superstorm Sandy, started with approximately 45,000 participants and strengthened security measures after the bombing of the Boston Marathon in April 2013. AFP PHOTO/EMMANUEL DUNAND (Photo credit should read EMMANUEL DUNAND/AFP/Getty Images)
NEW YORK, NY - NOVEMBER 03: Runners cross the Verrazano-Narrows Bridge at the start of the ING New York City Marathon on November 3, 2013 in the Brooklyn borough of New York City. (Photo by Maddie Meyer/Getty Images)
NEW YORK, NY - NOVEMBER 03: Police presence is heightened at the finish line during the 2013 ING New York City Marathon on November 3, 2013 in New York City. (Photo by Elsa/Getty Images)
Former winner Meb Keflezighi of the US is greeted by New York Road Runners President Mary Wittenberg (R) after he crossed the finish line in the Men's Division of the New York City Marathon on November 3, 2013 in New York. Keflezighi finished in 23rd place. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)
A New York Police Department officer watches the finish line at the New York City Marathon on November 3, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)
Runners cross the finish line at the New York City Marathon on November 3, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)
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