Heroic Mourn

"Thanks a ton, Wonderboy! But at least I've got one swell consolation prize--a friend of yours who's dying to see me!"

- -Hades told Hercules that he won the battle, but he's too late to save his love interest since she's going to die

Ever heroes or heroines sacrifice their own lives during the movie or the end after saving the world, etc.

Here's why the hero dies/heroes die:
 * Sacrificing their own lives
 * Saving their friends and/or family
 * Betraying the villain which that make the villain kill them
 * Dying with heartbreak, lost faith, by not believing in them or poisoning.
 * Dying for being old after many years

Sometimes it's not about sacrifice, but sometimes their love ones died long time ago or whatever reason which it make us cry so bad

Examples

 * Near the end of the film, Tom and Jerry: A Nutcracker Tale, shortly after the cats are defeated, Nelly the Horse sacrifices herself to save Jerry the Mouse and La Petite Ballerina from the falling wall and takes the impact herself, thus dying from her injuries and leaving Jerry and Tuffy Mouse and the toys mourning over her death until she is revived by magic which allows her to talk on her own without a string
 * In Harry Potter and The Deathly Hallows Part 2: Weasley family mourns over Fred's death in first battle of Hogwarts. As Harry goes through pensieve, the antihero Snape mourns over death of his friend, Lily Potter after she sacrificed herself to save Harry from Voldemort.

Quotes
"She was the bravest one of us all."

- Tuffy Mouse grieving over Nelly the Horse's death