We knew Jack Pearson (Milo Ventimiglia) was dead on This Is Us, but in 2018—yes, even though it felt like three years ago, we learned this in 2018—viewers finally learned what happened to the man, the myth, the legend. Jack survived the house fire, but later suffered a heart attack after too much smoke inhalation. He saved his family—and Kate's dog—and it cost him his life. The episode also featured some stellar acting work from Mandy Moore, and yes, we're still mad she didn't get nominated for an Emmy for it.