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Season 3 Finale: Spring Break Senior Year (Flash Forward)
We see Betty, Archie, and Veronica in their underwear standing around a fire. Betty says this: "We have to burn all of our clothes, including Jughead's beanie. We'll wash off the blood in the swimming hole. After tonight, we never speak of this, ever. Not to each other, not to our parents. No one. We finish our senior year, we graduate, and we'll go our separate ways. That is the only way that we won't get caught."
Archie throws Jughead's hat in the fire.
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Season 4, Episode 2: Spring Break (Flash Forward)
We see FP leading a search party in the woods in the rain, including Betty, Kevin, Archie, and Veronica, and they're all yelling for Jughead.
Season 4, Episode 3: Stonewall Prep
Jughead starts at a new boarding school, Stonewall Prep, where his grandfather went for a few months. He's living with familiar roommate Moose and unfamiliar and unfriendly roommate Bret. Bret and Jughead quickly became enemies, and we quickly saw that Bret has a thing for family legacies. Instead of going after Jughead, Bret started tormenting Moose.
Season 4, Episode 4: The Stonewall 4
Jughead learned of the Stonewall Four, four students who disappeared and were never seen again. Jughead nearly disappeared in this episode when he was trapped in a coffin, but that turned out to be a hazing ritual. Moose, meanwhile, really did fully disappear.
Season 4, Episode 4: Shady Charles?
Betty was happy to believe that her half brother (who is also Jughead's half brother, don't think about it too much) is who he says he is, but we saw that he was shadily listening to her phone conversation with Jughead. He's up to something, for sure.
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Season 4, Episode 4: Riverdale Coroner's Office (Flash Forward)
Jughead's dead! Or at least he appears to be in a scene that shows Betty and FP looking down at a dead body that looks an awful lot like Jughead. This scene curiously didn't tell us when it was taking place, but we can only assume it's around the spring break shenanigans.
Season 4, Episode 5: Forsythe Jones the First
Jughead learned a lot more about his grandfather, and there was one alumni writer who was particularly interested in that family history, and really wanted to meet Jughead's dad at a school event.
Season 4, Episode 5: Jughead's Writing Assignment
Jughead and his writing class are currently in the midst of a contest to become the next ghostwriter of his favorite mystery books, and their assignment is to write the perfect murder. Cut to:
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Season 4, Episode 5: Biology Class, Spring Semester (Flash Forward)
FP barges into biology class, where Betty, Archie, Veronica, Kevin, and Reggie are all working.
"Archie Andrews, Betty Cooper, and Veronica Lodge, you're under arrest for the cold-blooded murder of my son Jughead Jones," he says.
Season 4, Episode 8: Witness Line-up
Betty, Archie, and Jughead stand in a witness line-up, with Jughead's seminar classmates confirming that yes, those are the kids they saw murder Jughead.
Season 4, Episode 9: Dark Betty
In what appears to be the direct aftermath of Jughead's murder, Archie confirms that Jughead is dead, and then we see Betty, holding a rock, just like the one her dark self used to murder a cat (in her mind?).