Here is the authentically terrifying, true-life story recounted by historian Robert Damon Schneck in a chapter of his classic underground collection of weird Americana, which formed the basis for the major motion picture, The Bye Bye Man.
After going blind he began murdering people and cutting out their eyes and tongues, which he sewed together and brought to life using voodoo. The resultant creature became the Bye Bye Man's literal seeing-eye dog, helping him hunt his prey.