Every “Dallas” fan has one thing on his or her mind: “Who Killed J.R?” Before the mystery is solved, a few other questions must be addressed. Will the answers lead us to one of the eight potential suspects I named earlier this week?

1. Why was J.R. in Mexico? In “J.R.’s Masterpiece,” this week’s “Dallas” episode, we learned our hero was shot and killed in a flophouse in Nuevo Laredo, Mexico. According to the policewoman who investigated the crime, J.R. entered the country to go quail hunting. Later, his private eye Bum (Kevin Page) told Bobby, John Ross and Christopher that the quail hunt was a cover: J.R. was actually following a lead in his scheme to bring down Harris Ryland (Mitch Pileggi), the Texas trucking magnate who specializes in driving the Ewings crazy.

What business would Harris have in a place like Nuevo Laredo? The policewoman told the Ewings that the local drug cartels have started reaching out to “successful businessmen across the border for advice.” Bobby (Patrick Duffy) insisted J.R. would never do business with the cartel, and we don’t doubt him. Harris, on the other hand, might be the type to get mixed up in the illegal drug trade. After all, didn’t he try last season to blackmail Sue Ellen (Linda Gray) into laundering money for him?

2. Why was J.R. looking for Pam? Before J.R. entered Mexico, he went to Abu Dhabi to close an oil deal. But as Bum explained to Christopher (Jesse Metcalfe): “The reason he chose Abu Dhabi was because for the last several months, he’s been trying to find your mother.” Bobby’s stunned reaction: “You mean Pam?” Bum didn’t respond to Bobby; instead, he handed Christopher a document and said, “J.R. thought that once you’d seen this, you’d understand why it’s important for you to find your mama.”

Let’s pause here to remember that Christopher had two mommies: Kristin Shepard (Mary Crosby), his biological mother, who famously shot J.R. in 1980 and later drowned in the Southfork swimming pool, and Pam (Victoria Principal), Bobby’s first wife, with whom Bobby adopted Christopher after Kristin’s death. Assuming Kristin is really dead and that she isn’t the missing mama that J.R. was trailing, the question becomes: Why in heavens would J.R. want to find Pam, his longtime nemesis?

Some theories from Dallas Decoder readers: J.R. figured Pam, who abandoned Bobby and Christopher after she was badly burned in a fiery car crash, is the only person who might be able to talk her brother Cliff Barnes (Ken Kercheval) into finally ending his war against the Ewings. Or perhaps J.R. found evidence that Cliff had somehow bilked an unwitting Pam and/or Christopher out of their rightful share of the fortune they inherited from Pam and Cliff’s rich mother Rebecca Wentworth. (Could such evidence be included in the document that Bum handed Christopher?) Or maybe the aging J.R., seeking immortality, wanted to find Pam because he knew of her ability to dream dead Ewings back to life.

Whatever the reason, if Christopher resumes Uncle J.R.’s search and ends up finding Pam, don’t expect her to look like Principal. Earlier this month, as rumors swirled that Pam might return to “Dallas,” Principal issued a statement suggesting she will never resume the role.

3. Why did J.R. give John Ross a gun? After Bum handed Christopher the document about his mother, he gave John Ross (Josh Henderson) a box that contained J.R.’s gun. It came with this note:

“John Ross, if you’re reading this, it means I’m dead. And if I’m dead, that means Barnes is coming after you. You must crush him before he can win. I promised your Uncle Bobby that taking down Harris Ryland would be my masterpiece. I’d bet my last nickel Barnes will join forces with Ryland to destroy us. Use what I’ve given you to take from them what they want to take from us. When you’ve done that, Bobby will know what to do. And remember: You’re my son, tip to tail.”

Perhaps the most revealing thing about J.R.’s note isn’t his prediction that Cliff and Harris will join forces; it’s that J.R. wrote it in the first place. He knew his life was in danger, although this doesn’t necessarily rule out the theory that J.R. arranged his own death so it could be pinned on one of his enemies. If you buy that theory, you might think this is the gun that was used to kill J.R. But keep in mind: The coroner who examined J.R.’s body said he was killed with a “Saturday night special,” and that’s not the kind of gun John Ross received. On the other hand: Medical examiners on “Dallas” aren’t the most trustworthy people, are they?

4. Who is Lady X? When J.R.’s friend Carlos del Sol (Castulo Guerra) visited Southfork to update the Ewings on the investigation, he explained J.R. met a woman in a club near the hotel where he died. “Not your professional sort of lady, mind you, but there are witnesses to their assignation,” Carlos said. According to the policewoman who accompanied Carlos to the ranch, this mystery woman – let’s call her “Lady X” – asked J.R. to meet her near her workplace, which is how he wound up in the Hotel Colon. A witness saw someone follow J.R. to the hotel, but that person could not be found, the policewoman said.

So who is Lady X? Could she be one of the women I named as suspects earlier this week? Did she intentionally lead J.R. to the hotel, knowing he would be killed there? Did she pull the trigger herself? Does she really exist? Or did Carlos invent her because he’s involved in the killing and wanted to throw the Ewings off his trail?

5. What does Bobby know? Of course, despite what Carlos and the policewoman told the Ewings, we know J.R. was not the victim of a robbery. After Bum distributed J.R.’s “gifts” to John Ross and Christopher, he gave Bobby a sealed envelope. Bobby opened it, read the document it contained and walked out of the room, dismissing John Ross and Christopher’s plea for more information. “This is between my brother and me – for now,” Bobby said.

Outside the room, Bobby told Bum to “pay off whoever you have to pay off so that everybody still thinks J.R. was killed by a mugger. When the time comes, we’ll take care of this ourselves – as a family.” Bobby then walked into J.R.’s room, noticed the framed wedding photograph of J.R. and Sue Ellen, poured himself a glass of bourbon, sat on the bed and said: “I knew you’d have at least one more left up your sleeve, J.R.” He glanced at the document in his hand, half-smiled and continued: “It is a good one. I love you brother.”

So what did Bobby learn? During the “Dallas” cast’s panel discussion last week, Duffy revealed the show’s producers told him who shot J.R. so he would know how to play certain scenes, including this one. So whatever the document reveals, it holds a big clue to the identity of J.R.’s killer. I have my own theory, but for now, I’d rather hear yours. What do you think it says?

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