As the final season of "The Summer I Turned Pretty" unfolds on Prime Video, a startling fan theory has emerged, leaving viewers shocked and speculating about the fate of one of the central characters: Conrad Fisher. The theory posits that Conrad may be facing a serious illness that could potentially lead to his death.

The speculation gained traction after a TikTok user pointed out a few potential clues. One observation involves Belly's line in the Season 3 trailer: "Life's too short to not spend it with the person that you love," which some interpret as a tragic foreshadowing. The fan also noted instances where Conrad is seen clutching his chest throughout the season, although this could simply be attributed to anxiety.

Adding fuel to the fire, the theory suggests that Conrad's potential illness and demise could be connected to other seemingly minor details. For example, some fans have pointed out that Adam's new girlfriend, Kayleigh, doesn't drink champagne during the rehearsal dinner toasts in Episode 8. This has led to speculation that she might be pregnant, and if Conrad were to die, they might name the baby after him.

While the user admitted that the theory sounds far-fetched, they highlighted that Lola Tung, who plays Belly, allegedly cried when reading the script's ending. However, there is no credible source to confirm this. It's important to note that this theory remains unconfirmed, and viewers should take it with a grain of salt.

The series, which premiered its third and final season on July 16, 2025, has been releasing new episodes weekly, every Wednesday, and is scheduled to conclude on September 17, 2025. The show has seen some changes from Jenny Han's books.

Season 3 picks up two years after Belly and Jeremiah have started dating. They shock everyone when they reveal that they are planning on getting married. However, Belly reunites with Conrad in California. The official synopsis states that Belly is "looking forward to another summer in Cousins with her soulmate, Jeremiah," but "some core-shaking events bring her first love Conrad back into her life". Now, Belly is on the brink of adulthood and must decide which brother she wants to be with.

The cast includes Lola Tung as Isabel "Belly" Conklin, Christopher Briney as Conrad Fisher, Gavin Casalegno as Jeremiah Fisher, Jackie Chung as Laurel Park, and Sean Kaufman as Steven Conklin. New cast members include Isabella Briggs as Denise, Sofia Bryant as Anika, Lily Donoghue as Lacie Barone, and Kristen Connolly as Lucinda Jewel.

With the series finale approaching, fans are eager to see how Belly's love triangle with Conrad and Jeremiah will be resolved. Some fans believe that Belly and Conrad will ultimately reconcile, while others think that Belly will choose herself and embark on a journey of self-discovery.

Only time will tell if the fan theory about Conrad's potential demise holds true. Regardless of the outcome, the speculation has undoubtedly added another layer of intrigue to the final season of "The Summer I Turned Pretty."