Throughout the “Who Killed J.R.?” mystery, one thing has nagged at me: Is anyone “big” enough to take down the “Dallas” legend? This is why I never considered characters like Carlos del Sol or Carmen Ramos (Castulo Guerra, Marlene Forte) to be serious suspects. Even Harris Ryland (Mitch Pileggi), as important as he’s become to this franchise, hasn’t earned the “right” to go down in history as the man who murdered J.R. Ewing (Larry Hagman).

Frankly, only one character has enough stature to take out J.R. – and that’s J.R. himself. So during the first few weeks of this storyline, I figured we’d eventually discover our hero was secretly suffering from a terminal illness and arranged his own shooting – perhaps J.R.’s loyal private eye Bum (Kevin Page) pulled the trigger – so that his “murder” could be pinned on one of the Ewings’ enemies.

Many of my fellow “Dallas” diehards found the idea of J.R. taking his own life anathema, and I’ve come around to their way of thinking. Also, if the show went the J.R.-arranges-his-own-death route, it could be perceived as a cop-out – and let’s face it, this franchise already pulled a fast one on the audience when it explained away Bobby’s death as a bad dream. Would the people who make the new “Dallas” want to risk alienating fans again?

For awhile, I also theorized J.R. could’ve been done in by an enemy from his past. My suggestion: What if Kristin Shepard (Mary Crosby) was still alive and returned to finish the job she started in 1980? This idea also turned off a lot of fans, who suggested it would be the ultimate retread: It would turn “Who Killed J.R.?” into “Who Shot J.R.?” all over again, right down to the same assailant. I see their point, but I still think it would be cool.

The other great choice from the “old enemies” camp would be Katherine Wentworth (Morgan Brittany), especially if it turned out she faked her death and stole Pam’s identity. I also love the idea that Katherine is somehow connected to Harris, and that she used a Ryland Transport truck to orchestrate the car accident that disfigured Pam and prompted her to flee Southfork in the first place. What a twist that would be! Unfortunately, based on recent comments from Brittany and “Dallas” producer Cynthia Cidre, it doesn’t sound as if Katherine will be returning to the show anytime soon.

This leaves one viable suspect as J.R.’s killer: Cliff Barnes (Ken Kercheval). Think about it: Cliff has become a pretty soulless figure this season. He allowed his “son” Frank Ashkani (Faran Tahir) to kill himself and ordered the bombing of the Ewing Energies rig, even though it put the lives of many people at risk, including his daughter Pamela (Julie Gonzalo), who ended up losing her unborn twins. I have a feeling the worst is yet to come too. Maybe it will turn out Cliff also killed Katherine and somehow kept Pam from returning to Southfork. Perhaps J.R. was about to expose these sins, and that’s why Cliff finally offed his old enemy.

Where does Harris’s Mexican trucking operation and club hostess Rhonda Simmons (Emily Kosloski) fit in? Suppose Carlos and Cliff are in cahoots; Carlos knew his “friend” J.R. was interested in digging into Harris’s past, so he lured J.R. to Nuevo Laredo by leading him to believe Harris was up to something shady south of the border. (Could it be Harris really is transporting nothing more than ugly high heels?) Once J.R. arrived in Nuevo Laredo, Carlos tipped off Cliff, who came to town and shot J.R. (Or maybe Frank isn’t really dead and pulled the trigger on Cliff’s behalf.) Rhonda is part of the scheme and lied to Bobby about Harris’s Nuevo Laredo connection to help Carlos cover his tracks. Before all is said and done, maybe Cliff will even turn on partner-in-crime Harris and try to frame him for J.R.’s death.

Would it be shocking if Cliff turns out to be the killer? No and yes. On the one hand, J.R. is murdered by his oldest adversary? Where’s the surprise in that? On the other hand: Besides Patrick Duffy and Linda Gray, Kercheval is the only original “Dallas” cast member who has a regular presence on the new show. From this standpoint, turning him into a killer would be bold.

Also, consider this: “Who Killed J.R.?” has never been much of a traditional whodunit. From the beginning, this storyline has been about tying up loose ends (“Where in the world is Pam Ewing?”) and settling old scores. Now that J.R. is gone and Cliff has taken control of Ewing Energies, what else is left for him to do?

Besides, it’s not like there isn’t room for a big twist: There’s still the matter of the letter that J.R. left for Bobby. What does it say? Perhaps it will reveal John Ross (Josh Henderson) really is Cliff’s son after all. J.R. faked the paternity test all those years ago to spare his family – and himself – a lot of embarrassment and raised John Ross as his own. This would undoubtedly upset a lot of fans, but it would also add a new shade to J.R.’s character and give new meaning to the famous scene where he holds John Ross for the first time. As for John Ross’s recent nuptials to Pamela, look at it this way: She already married her cousin. Why shouldn’t her brother be next?

I think it’s more likely the letter to Bobby reveals that Christopher (Jesse Metcalfe) is actually J.R.’s son. Perhaps J.R. concealed the truth from Bobby because he knew how much his brother and Pam needed a child of their own. This might explain Bobby’s heartfelt line after he received J.R.’s note after the funeral: “I knew you’d have at least one more left up your sleeve, J.R. It is a good one. I love you brother.”

As for the gun that J.R. left John Ross? Maybe it will turn out to be the gun that Pamela (Julie Gonzalo) used to shoot Tommy and the Ewings will use the weapon as leverage to gain control of Barnes Global. When the Ewings threaten to expose Pamela’s crime, Cliff finally does something selfless and protects his daughter by fessing up to J.R.’s murder, allowing Pamela and John Ross to take control of two-thirds of Barnes Global, with Christopher finally inheriting his mother’s third.

Once the Ewings control Cliff’s company, maybe they can turn Harris out of Ryland Transport, assuming the money Cliff gave Harris last week comes with strings attached to Barnes Global. This might explain J.R.’s cryptic description of the gun in his note to John Ross: “Use what I’ve given you to take from them what they want to take from us.” In other words: They want to take our company from us, so we’ll take theirs from them.

Then again: Knowing this show, there’s a good chance every one of my guesses is wrong. Who knows what twists and turns await us tonight?

Who done it? Share your final theories below and read more posts on Dallas Decoder’s “Who Killed J.R.?” page.