Ekpo-Umoh last competed for her birth country Nigeria at the 1994 World Junior Championships. She defected to Germany in 1995 during a training camp there, married her German trainer in 1998 and received German citizenship in 2000. Since 1998, she represented the sports club USC Mainz.
In 2003, Ekpo-Umoh was found guilty of stanozolol doping. The sample was delivered on 24 January 2003 in an out-of-competition test in South Africa. She was suspended from the sport until March 2005.
Her personal best time is 51.13 seconds, achieved in June 2001 in Stuttgart.
|1994||World Junior Championships||Lisbon, Portugal||8th (sf)||400m||53.84|
|14th (h)||4 × 400 m relay||3:49.16|
|2001||World Indoor Championships||Lisbon, Portugal||3rd||4 × 400 m relay||3:31.00|
|World Championships||Edmonton, Canada||2nd||4 × 400 m relay||3:21.97|
|2002||European Championships||Munich, Germany||1st||4 × 400 m relay||3:25.10|
|World Cup||Madrid, Spain||6th||4 × 400 m relay||3:31.09|
- "Grimes fails drugs test". BBC. 2003-08-13. Retrieved 2007-09-14.
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