The Japanese voice actor for Mr. Satan (also known as Hercule) passed away at the age of 67 on August 13th, 2018. The cause of death was esophageal cancer. While many know him for his long tenure as the voice of Mr. Satan in the Dragon Ball franchise, he is also well known for his work as Professor Oak (Pokémon), Jet Black (Cowboy Bebop) and many more.
He is a legendary person. May he rest in peace.