 As Locke leaves to get shovels as well as Eko's stick (he believes it'd be inappropriate to bury him without it), Sayid follows him and asks what really killed Eko.Locke says that the survivors call it "The Monster", and further speculates that The Monster may be what brought them there and that Eko died for a reason, he just does not know what it is yet.During the burial, Locke sees a message on Eko's stick