I apologize if I got my people mixed up. I should have checked my source before posting. It is not Smoot that I am referring too but rather the original source is based on David Patten’s story of encountering Cain, whom he described as very tall and covered in dark hair, in 1835, as described in a letter published in Lycurgus Wilson’s biography of Patten. Spencer Kimball copied the letter in Miracle of Forgiveness. It is Patton's diary that is always seen as kind of suspect. There is also similar stories that are very similar like all urban myths. I am not sure why Spencer Kimball added it to his book, but it is just a bad source to quote from.
It is all folklore and myth that is a reflection of 19th century ideas of evil and race. There is no doctrine about Cain and I do not think you would get any of the 12 to say different. In the Hebrew the "mark" talked about in Genesis literally means a brand, or a tattoo. It is nothing to do with a physical change of of skin color or appearance. It is a racist notion left over from the 19th century. Ask any rabbi or Hebrew scholar and they will tell you that Cain's mark was not a skin color change or any Bigfoot transformation.
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