"It's an absolute soul-crushing event," the actor told Entertainment Weekly of Jack's anticipated death. "Once you figure out the moment where it's going to happen, you may get some hope and then it's all going to go away."
"When they learn what happened to Jack, I think people are going to find themselves surprised with their own emotion. I really think people are going to have a hard time accepting it," Ventimiglia added.
Ugh, our eyes are already welling up.
Jack's death has been teased to viewers of the NBC hit drama since his daughter Kate, played by Chrissy Metz, introduced her new boyfriend Toby, played by Chris Sullivan, to her father's urn in the fifth episode of Season 1. Since then fans have stormed up numerous theories about what could have possibly happened to the proud father of three, but Ventimiglia said he's thankful when fans keep their ideas to themselves.
"It's very respectful as well as kind because I don't want to sit there and deflect too much," he said. "Because I'm sure at some point someone's going to say something that's going to ring true and then my talent as an actor is really going to come to the forefront. It's the hardest position to be in because I want people to know, but I also want them to wait for it."
And even through inevitable heartbreak that is looming around the corner, the 40-year-old actor added that he truly hopes fans don't become so overwhelmed with the mystery surrounding Jack's death that they lose sight of the type of man his character was to the Pearson family.
"I still say to people, 'Focus on the man's life and don't show me at least how much you're salivating for his death," he said. "I'm like, 'Man, wait 'til people find out this next bit of information that they're going to start to understand about Jack or the family.' God, there's so much still to learn about these people, so I hope people can get the satisfaction of the death and move on and understand it goes even deeper."
At the end of the day, Ventimiglia reminded his fans that Jack's ultimate death doesn't translate to him saying goodbye to the NBC drama.
"There is still so much story to mine in this world of 'This is Us,'" he said. "I think at that point then you gotta start wondering if anyone else is going to die. I'm going 'Whoo! All right! I'm off the hook!'"