With the death of Larry Hagman, television loses one of its best villains ever. And I mean ever. The scariest sight on television was not some Sopranos thug or Dexter psycho or Game of Thrones inbred deviant. It was J.R. Ewing flashing his pearly whites in your direction, uttering the words, "Have I got a deal for you." The "Who shot J.R.?" cliffhanger at the end of season two of Dallas was a TV event unlike any other and while the near-fatal wound tamed the venomous one for a season, he was back in form before very long.
I've no idea of Hagman's personal religious beliefs, but I am willing to bet that if there is a personification of evil such as the being some name Satan, Hagman's might be the only soul he doesn't want to capture. After all, if you give J.R. Ewing enough time, he'll find a way to get the better of you. And eternity is plenty of time.