No Sith died in Episode 5.
You may be thinking about Jedi Master Even Piell a Lannik, which is not the same species as Yoda; but Piell did not appear in "Revenge of the Sith". He did appear in Episode I and Episode II, but died during the Clone Wars.
According to Wookieepedia, he was 80 in "Attack of the Clones" and was 83 when he died by Anakin Skywalker in "Revenge of the Sith"
Rogue One is set some time after the events of Star Wars: Episode III - Revenge of the Sith and shortly before the events of the original Star Wars movie (Star Wars: Episode IV - A New Hope). It is supposed to be about a group of Rebel spies on a mission to steal the plans for the Galactic Empire's new superweapon, the Death Star. Perhaps we will find out more about how and why "Many Bothans died to bring us this information." [quote from the original Star Wars]
Mace Windu dies at the end of Return of the Sith, which takes place at the end of the Clone Wars. He does not die during the Clone Wars television show.
In Revenge Of The Sith he was 37 Years Old
Captaian Rex apears ONLY in Star Wars The Clone Wars in bothe the movie and show.
No, Star Killer died in Star Wars the Force Unleashed. In Star Wars the Force Unleashed ll, you play the clone of Star Killer
His wife died
In Star Wars: A New Hope (the first episode made), Obi-Wan Kenobi dies.
So far, there is no record of the very first Jedi Knight and the very first Sith lord just yet ( starting from ( is someone different the first sith lord was Darth Bane who went into hiding when the Jedi thought the sith were extinct. then He raised an apprentice then she had and apprentice then he had an apprentice who was Darth sidious. And the first Jedi was Yoda who was 999 nine hundred and ninety nine when he died in Return of the Jedi )
So many people!
Luke Skywalker has yet to die in the Star Wars universe.