Georgina Rono, a Kenyan runner who finished third in the Boston Marathon in 2012, was banned for four years on Tuesday for evading a doping test.
Rono, who has also finished on the podium at the Eindhoven and Frankfurt Marathons, was banned until January 25, 2027. The Anti-Doping Agency of Kenya ordered that all of her results since May 27 be removed from her record.
Kenyan authorities are dealing with a doping crisis, with more than 50 East African athletes currently suspended.
The extensive problems raised fears of an outright ban for the Kenyan Athletics Federation late last year, but the governing body of track and field backed down from that harsh sanction after the Kenyan government promised to devote more funding to its anti-doping effort.
Since 2000, Kenya has won the second-most Olympic medals, trailing only the United States, but it has struggled to police its athletes.