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Twitter reacts to Jacks heartbreaking death on This Is Us
THIS IS US -- "The Best Washing Machine in the Whole World " Episode 107 -- Pictured: (l-r) Mandy Moore as Rebecca, Milo Ventimiglia as Jack -- (Photo by: Ron Batzdorff/NBC) - photo by Herb Scribner
Warning: Mild spoilers for This Is Us follow.

This Is Us fans felt true heartbreak Sunday night, as the show finally revealed how beloved father Jack Pearson (Milo Ventimiglia) died.

Pearsons death has been a longstanding mystery from the shows beginning. Now in its second season, the mystery is over.

Picking up right after the shows previous episode, in this episode, the Pearson family find themselves trapped in a house fire. Jack works to bring his family to safety, running across the halls and through large flames to rescue his children. The family escapes the home.

Then they hear their dog bark from inside the house. Jack runs back in the house, saving the dog and some family memorabilia in the process, according to USA Today.

Jack only seems to have suffered from a burned hand and smoke inhalation. He succumbs to a heart attack at the hospital, however, because of the smoke while his wife, Rebecca (Mandy Moore), is at a vending machine getting candy.

Twitter could not handle Jacks death.