From Bulbapedia, the community-driven Pokémon encyclopedia.
Takeshi Shudō (Syudo also seen, Japanese: 首藤剛志; August 8, 1949 — October 29, 2010) was the chief writer for the original series of the Pokémon anime, as well as being the sole writer for the first three Pokémon movies and the Mewtwo Returns TV special. He also wrote several novelizations of the anime.
Shudō is perhaps best known as the creator of the classic manga and anime series, Magical Princess Minky Momo. His other credits include Martian Successor Nadesico and Legend of the Galactic Heroes. He was a script writer for many small-time manga and anime series until offered a position of scripting at The Pokémon Company, and was made the head writer nearly instantly.
He was hospitalized on October 28th, 2010 when he was found collapsed at a train station in Nara. He was later pronounced dead on October 29th, 2010 early in the morning at the age of 61, the cause of death being a Subarachnoid hemorrhage.