William Wilson and Richard Paulsen offer history of Mormon use of Cain account.
William Wilson and Richard Paulsen, "The Curse Of Cain And Other Stories: Blacks In Mormon Folklore," Sunstone (1980), 9
Some stories tell not of the devil, but of Cain, who also appears as a black man. As early as 1835, Apostle David Patten claimed to have encountered Cain while on a mission in Tennessee. Today Cain stories still circulate. In a typical example, missionaries tracting a white section of a town in Georgia were surprised when "a huge black Negro came to the door and hurled obscenities at them. His mein was hideous, and the missionaries left, much frightened." Their mission president later told them that the man had been Cain, that the town was very wicked, and that they should no longer labor there.