We asked members of the BuzzFeed Community which TV deaths were so shocking and monumental that they changed everything. Here are the responses:
🚨Warning: There are MASSIVE spoilers ahead!🚨
1. On The Walking Dead, when Glenn was brutally beaten to death by Negan as his friends and Maggie watched.
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2. On Grey's Anatomy, when George was hit by a bus in an attempt to save another person, and his friends couldn't even recognize him until it was too late.
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3. On Orange Is the New Black, when Poussey tried to help calm Suzanne, but a guard attacked and killed her.
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4. On The Originals, when Mikaelson brothers Klaus and Elijah used the white oak stake to kill each other because they realized that their redemption journey was finally complete.
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5. On Once Upon a Time, when Robin Hood was killed by Hades after he saved his true love Regina's life.
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6. On Pretty Little Liars, when Maya was murdered by a stalker who pretended to be her cousin.
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7. On The 100, when Lexa was accidentally shot by someone who actually meant to shoot Clarke.
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8. On Grey's Anatomy, when Derek Shepherd got hit by a truck and died solely because of a doctor's careless decision not to get a brain scan.
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9. On Glee, when the creators wrote Cory Monteith's real-life death into the series and dedicated an entire episode to him and his character, Finn Hudson.
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10. On Sons of Anarchy, when Opie was beaten to death by a prison gang as his friends watched helplessly from the next room.
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11. On Downton Abbey, when Sybil experienced eclampsia after successfully delivering her baby, which caused her to suffocate and die.
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12. On Degrassi: The Next Generation, when J.T. was stabbed outside a friend's party and Liberty found him after it was too late to save him.
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13. On This Is Us, when Jack was at the hospital being treated for a burn on his arm but suffered a heart attack from too much smoke inhalation and died.
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14. On Criminal Minds, when Hotch's ex-wife, Haley, was killed just as the FBI were on their way to save her, and the entire team listened to it happen over the phone.
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15. On Lovecraft Country, when Tic heartbreakingly died during the ceremony that would make Christina immortal.
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16. On Nashville, when Rayna survived a terrifying encounter with a stalker, only to get into a car accident as she was being escorted away in a cop car.
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17. On Jane the Virgin, when Michael collapsed and stopped breathing because of complications from his gunshot wound.
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18. On Money Heist/La Casa de Papel, when Gandia shockingly shot and killed Nairobi.
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19. On The O.C., when Marissa got into a car crash while on her way to the airport, and Ryan tried to carry her to safety, but she died in his arms.
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20. On How to Get Away With Murder, when Wes's corpse was revealed next to the burning building, and Annalise shouted in horror.
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21. On The Boys, when Ryan used his powers and accidentally killed Becca in the process.
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22. On 13 Reasons Why, when Justin Foley had finally redeemed himself and had the best character arc on the show, only to then be diagnosed with AIDS and killed off.
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23. And finally, on The Haunting of Bly Manor, when Dani became the lady in the lake and Jamie went and found her body at Bly Manor.
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Note: Some responses have been edited for length and/or clarity.