 Mr. Eko Tunde is a fictional character , played by Adewale Akinnuoye @-@ Agbaje on the ABC television series Lost . He is introduced in the second season episode " Adrift " as one of the plane @-@ crash survivors from the plane 's tail section . Flashbacks reveal that he became the leader of a gang of guerrillas to save his brother when he still lived in Nigeria . He assumed his brother 's identity and became a priest after his brother was killed in a botched drug smuggle ; Eko killed two guerrillas in defense , was ostracized , and left Nigeria to become a priest in Australia . After investigating the alleged miracle of a girl who came back to life after drowning in Australia in 2004 , Eko boarded Oceanic Airlines Flight 815 . This plane crashed and left Eko , along with a few other survivors , on a deserted island . 
