Chapter 574 is titled “Portgas D. Ace Dies”.

What volume did Ace die?

One Piece, Volume 59: The Death of Portgaz D. Ace by Eiichiro Oda.

What did ace say before he died?

Even though I’ve been good for nothing my whole life, even though I have the blood of a demon within me You guys still loved me! Thank you so much!! – Ace’s last words to his family and friends.”

Ace visited Wano Country for years before the current storyline, where he met Otama. Ace promised to come back to Wano Country and free it one day by defeating Yonko Kaido but unfortunately, he died before accomplishing this goal.