In the following season, The Man in Black confronts Mr. Eko as the monster for his past sins. As Eko stares down The Man in Black, he sees flashing images of his past. In season three, The Man in Black takes the form of Eko's brother, Yemi (Adetokumboh M'Cormack), and demands Eko to repent for his sins. When Eko refuses, The Man in Black briefly disappears, only to return as the monster. He then kills Eko by slamming him repeatedly against nearby trees and the ground. Midway through that season, The Man in Black appears to Juliet Burke (Elizabeth Mitchell) and Kate as the monster; during the encounter, the monster releases a series of bright flashes. He later reappears and it is revealed that he cannot penetrate the sonar fence that surrounds the Barracks of the Dharma Initiative.
