Here's a breakdown:
* The Clone Wars: Savage Opress is a major antagonist in the series. He is captured by the Republic, but escapes and eventually forms an alliance with Darth Maul. He is defeated in a duel against Ashoka Tano and remains in a coma.
* Star Wars Rebels: Savage Opress is briefly mentioned in the series, but does not appear.
* Star Wars Rebels Season 4: Savage Opress is revived by Maul, who plans to use him in his quest for revenge against Obi-Wan Kenobi. However, Savage Opress is ultimately killed by Maul, who does not want to share power.
So, while Savage Opress does not die during The Clone Wars, he eventually meets his demise in the series Star Wars Rebels.