Thomas Jefferson did not believe in the miracles described in the KJV so he re-wrote the NT with no miracles and it was no longer the KJV but the Jefferson Bible.
Oddly enough, even tho the KJV I got from the Mormons was recently published, it was NOT altered. I went to a comparative website that mentioned a big list of scripture changes that Joseph Smith, Jr. made, and NONE of them are in the version I got from them. So, they evidently didn't change my version, but I understand that they do have their own version available.