(CNN) -- The International Olympic Committee has stripped American cyclist Tyler Hamilton of his 2004 gold due to doping and ordered him to return the medal that he won in the Athens Olympics.
"Hamilton, 41, who finished first in the men's individual time trial and 18th in the men's road race at Athens 2004, was disqualified from those events after he admitted to having used performance-enhancing drugs in advance of the Games," the IOC said in a press release Friday.
Yonas Kifle of Eritrea is cheered by spectators as he competes in the men's marathon on day 16 of the London 2012 Olympics, Sunday, August 12, the last day of the Games. See all the action as it unfolded here, and check out the best images from day 15 of competition on Saturday, August 11.
Day 16: The best photos of the Olympics
The IOC also ruled that the riders who finished behind Hamilton in the individual time trial in Athens will now be moved up in placement.
That means Russian Ekimov Viatcheslav Ekimov will now get the gold medal, and American cyclist Bobby Julich will get the silver. Michael Rogers of Australia, who finished fourth, will now get the bronze.
Hamilton made headlines last year when he accused fellow American cyclist Lance Armstrong of doping.
Armstrong, Hamilton's former teammate, has strongly denied those allegations.
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U.S. forward Carmelo Anthony, left, and Spanish center Serge Ibaka struggle for the ball during the men's gold medal basketball game between the United States and Spain.
Juan-Carlos Navarro Spain drives to the goal past Kevin Durant and Chris Paul of the United States.
U.S. players celebrate after defeating Spain to win the gold medal in men's basketball.
Croatia's Josip Pavic, center, celebrates with his teammates after Croatia defeated Italy in the men's water polo gold medal match.
Cuba's Livan Lopez Azcuy, left, wrestles Azerbaijan's Jabrayil Hasanov in their men's 66-kilogram freestyle bronze medal match.
France's centerback Daniel Narcisse, center, is challenged by pivot Tobias Karlsson, left, and right back Kim Andersson of Sweden during the men's gold medal handball match between Sweden and France.
Sweat flies off Anthony Joshua of Great Britain as he takes a punch from Roberto Cammarelle of Italy during the men's super heavyweight boxing final bout. Joshua went on to win the gold medal.
The Bulgarian team performs during the group all-around rhythmic gymnastics final.
Tamara Vega of Mexico riding Douce de Roulad from her mount in the women's modern pentathlon.
Czech Republic's Jaroslav Kulhavy is overcome by the moment after winning the men's cycling cross-country mountain bike race.
Goalkeeper Josip Pavic of Croatia makes a save during the men's water polo gold medal match between Croatia and Italy.
France's players are joyous after winning the men's gold medal handball match between Sweden and France.
India's Sushil Kumar reacts during his fight against Japan's Tatsuhiro Yonemitsu in their men's 66-kilogram freestyle gold medal wrestling match. Kumar won the silver medal.
Two Croatian players and a member of the coaching staff jump into the pool after winning the gold medal in men's water polo.
U.S. basketball players Kobe Bryant, Tyson Chandler and LeBron James head to the court before the start of the men's basketball gold medal game against Spain.
U.S. fans show their support at the men's gold medal basketball game between the United States and Spain at the North Greenwich Arena in London.
South Africa's Burry Stander, right, and Italy's Marco Aurelio Fontana navigate the course in the men's cross-country mountain bike race at Hadleigh Farm in Benfleet, England.
Abel Kirui of Kenya gives thanks after winning the silver medal in the men's marathon at The Mall in London.
Robeisy Ramirez Carrazana of Cuba celebrates winning the gold medal by defeating Tugstsogt Nyambayar of Mongolia in the men's boxing flyweight 52-kilogram final match.
Cheers and an array of cameras greet runners as they wind their way through the streets of London during the men's marathon.
Runners pound the streets of London during the men's marathon. Stephen Kiprotich won the race to give Uganda its first gold medal of the Games.
U.S. wrestler Jacob Varner celebrates after defeating Ukraine's Valerii Andriitsev in the men's 96-kilogram freestyle gold medal wrestling match in London.
Czech cyclist Jaroslav Kulhavy crosses the finish line ahead of Switzerland's Nino Schurter to win men's cross-country mountain bike race at Hadleigh Farm.
Tyson Chandler takes the ball to the hoop in the men's basketball gold medal game between the United States and Spain at North Greenwich Arena in London.
Kazakhstan boxer Serik Sapiyev enjoys the thrill of victory after defeating Freddie Evans of Great Britain in the men's welter 69-kilogram boxing final bout.
Livan Lopez Azcuy, in red, of Cuba grapples with Jabrayil Hasanov of Azerbaijan during the men's freestyle 66-kilogram wrestling bronze medal bout in London.
Cyclists speed through the course during the men's cycling cross-country mountain bike race at Hadleigh Farm.
Takao Isokawa, in blue, of Japan is taken down by Magomed Musaev of Kyrgyzstan in the men's freestyle wrestling 96-kilogram eighth-final match.
Hungary's pivot Szabolcs Zubai dives and takes a shot during the men's bronze medal handball match against Croatia.
Sushil Kumar, in blue, of India battles with Akzhurek Tanatarov of Kazakhstan during the men's freestyle wrestling 66-kilogram semifinal match.
Argentinian forward Andres Nocioni, left, challenges Russian center Timofey Mozgov during the men's bronze medal basketball game at the North Greenwich Arena. Russia won 81-77.
Athletes pass by Big Ben and the Palace of Westminster during the men's marathon.
Reza Mohammad Ali Yazdani of Iran is treated for an injury during the men's freestyle wrestling 96-kilogram semifinal match.
Carlos Delfino of Argentina reacts to a call during the men's basketball bronze medal game against Russia.
Dejected Bulgarian players look on during their loss to Italy in the men's volleyball bronze medal match.
Argentine guard Carlos Delfino, right, challenges Russia's Vitaliy Fridzon for the ball during the men's bronze medal basketball game.
Italy's Michal Lasko, left, and Ivan Zaytsev seal their victory with a kiss from loved ones after defeating Bulgaria in the men's volleyball bronze medal match.
Manu Ginobili, center, of Argentina drives down the lane during the men's basketball bronze medal game against Russia. See photos from the closing ceremony.
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