Why Episode Does Ace Die?

"Looking for the Answer - Fire Fist Ace Dies on the Battlefield" is the 483rd episode of the One Piece anime.

Who killed portgas D Ace?

Ultimately, the Pirates succeeded in freeing Ace. But, he chose to sacrifice his life to save Luffy from Admiral Akainu. Ace's death was one of the biggest shocks in One Piece, because this series isn't really known for killing off people. When Oda did it, even his editors didn't want to see this.

What happened to Luffy when Ace died?

After witnessing the death of Ace at the hands of Akainu, Luffy becomes completely incapacitated. Akainu then attempts to kill Luffy, but Marco fight him to protect Luffy, and Jimbei flees with him.