Who shot (and killed) J.R.? Down at Southfork, they’re all too sad to care.

One of the last things viewers of TNT’s skillfully revivified “Dallas” saw J.R. Ewing do was acquaint himself with the wonders of an iPad. “Honey, I don’t need any more angry birds,” the elderly and still devilish demon of Southfork Ranch quipped to his comely helper. He then IM’d one of those meddlesome video links to his brother Bobby: “It’s a dog playing basketball,” J.R. typed. “Doesn’t that beat all?” Read fu...