 Marilyn suffered an injury plagued 2009 outdoor season, though she battled through the pain barrier to finish a very credible 8th in the World Championships 800 m final in Berlin.Okoro was also included in the squad for the 4 × 400 m, but was not selected in the line-up to run in the final.Marilyn had a limited race schedule in 2010, but returned to a degree of form when taking bronze at the UK championships.