Takeshi Shimoda was Gichin Funakoshi's assistant and instructor and was the most talented of O-sensei's students (in Shigeru Egami's words) in the early thirties. He traveled around Japan together with Egami among other Funakoshi followers giving demonstrations of Karate. He was an expert in Kendo of the Nen-ryu school and also studied Ninjutsu.
He became seriously ill after one of the demonstrations and died soon afterwards, he was still in his thirties.
Shigeru Egami recounts:
It was a very hard blow not only for O-sensei to lose him so early in his life, it was also put Karate in a very complicated situation, how to replace him. His duties were taken over in a very favorable way by Yoshitaka (Gigo) Funakoshi.