'This Is Us' Season 2 Spoilers & News Update: Why Are Fans Worried? Cast Members Celebrate First Season; Party Photos Released!

"This Is Us" has moved a lot of viewers to tears, given the emotional rollercoasters the show has brought. After being revealed that Jack Pearson will not live long, the fans are now speculating about how the character will die.

One of the "This Is Us" theory reveals that Jack may have perished from a USAir Flight 427 crash in 1994, in a flight heading to Pittsburgh. According to a Redditor that came out with the theory, it is likely that Jack was aboard the plane, but was able to speak to Kate before he died.

"This Is Us" may have planted the clues, if the theory about the plane crash is true, given the fact that Kevin has admitted to destroying all of the model airplanes made with this father following Jack's death. Although not exactly similar, Kevin maintains that the Challenger explosion has been particularly difficult for him in the pilot episode.

That said, there are speculations that Kevin may have considered the Challenger as a sign of his father's death in a different type of aerial accident. Nevertheless, "This Is Us" theories remain as pure speculations, Refinery29 reported.

"This Is Us" has just wrapped up filming its first season this month. However, as the fans were left in tears by the popular NBC show, the cast celebrated with a party last Thursday at the Hollywood Roosevelt Hotel in Los Angeles. In fact, the photos that were later posted are expected to make the viewers forget about their emotions and will instead put them into a smile.

"This Is Us" cast members who were in attendance include Justin Hartley, who played the role of Kevin, Logan Shroyer and Parker Bates, who portrays the younger versions of Kevin's character. A photo of the three was shared by Hartley's fiancée, Chrishell Stause, ET Online reported. Watch "This Is Us" - Aftershow: Episode 15 here: