Akira Toriyama, the influential Japanese manga artist who created the Dragon Ball series, has died at the age of 68.

He died on 1 March from an acute subdural haematoma. The news was confirmed by Bird Studio, the manga company that Toriyama founded in 1983.

“It’s our deep regret that he still had several works in the middle of creation with great enthusiasm,” the studio wrote in a statement. “Also, he would have many more things to achieve.”