Frederick Adetokumboh M'Cormack (born February 27, 1982), sometimes credited as Ade McCormack, Frederick McCormack, or Adetokumoh McCormack, is a Sierra Leonean-born American actor, known for his roles in the television series Lost and Heroes.
M'Cormack was born in Freetown to Sierra Leone Creole parents. 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. He played Zeze Eto'o in 24 during season 7, episodes 4 and 5, and the recurring antagonist Isaac on Castlevania.
His first feature film was the Academy award-nominated Blood Diamond (2006).