Frederick Adetokumboh McCormack (sometimes credited as Adetokumboh McCormack, Frederick McCormack, or Adetokumoh MCormack) is a Sierra Leone Creole actor, known for his roles in the television series Lost and Heroes.
McCormack was born in Sierra Leone. He lived in Nigeria and Kenya before attending SUNY Purchase in New York. He currently resides in Los Angeles.
He has appeared in numerous TV-series, and he portrayed a recurring character on Lost as Mr. Eko's deceased brother, Yemi. He also portrays the recurring role of Tuko on Heroes. His next TV role is in the 24 TV Series, starring Kiefer Sutherland. He will be in Season 7, Episode 4 and Season 7, Episode 5 as the character Zeze EtO'o.
His first feature film, was the Oscar nominated Blood Diamond (2006), starring Leonardo DiCaprio, Jennifer Connelly and Djimon Hounsou.