In another scene, a teenage Kate is sobbing as she holds a dog and Randall is in tears, at what appears to be Miguel's home. Kate tells Randall she needs to find Kevin to tell him the news. The show then flashes to Kevin kissing a girl, and wearing a cast.
While it seems Jack died in a house fire, there are still unanswered questions.
Milo Ventimiglia, who plays Jack, told "Extra's" Renee Bargh at the Season 2 premiere Tuesday night, "We made it... I didn't spill the family secrets." Watch!
He went on to explain that the writers kept the cause of death a secret by omitting parts from the script. "It was secrecy... Omitting scenes from the script, it added to the value that we all needed to keep a secret."
Milo added that he hopes Jack and Rebecca were in a good place in their relationship when Jack died. "Hopefully they've come to some kind of reparation," he said.
Chrissy Metz, who plays Kate, hinted that her character may have some guilt over her dad's death. "'It's Kate fault. It's Kate's fault.' I think as a family anybody would feel some sense of guilt in some capacity about how their father passed away."
Be sure to watch the next episode of "This Is Us" Tuesday at 9 p.m. on NBC.