Actually, Eichihiro Oda died of a brain tumor in 2002.
And since that day, One Piece has continued. Who draws it? NO ONE.
IT DRAWS ITSELF.
One time they got scared and took the paper it had drawn itself on and burned it. But the comic STILL SHOWED UP IN THAT WEEK'S JUMP, DESPITE THERE BEING NO ARTWORK TO PRINT. No one can explain this phenomena.
On November 3rd, 2002, a man dressed in white appeared at the Shueshia offices in Tokyo. He was carrying a black suitcase and refused to speak to anyone except the editor-in-chief of Jump. Despite having no credentials or identification, he was immediately shown up to the editor's office. When asked why they let him in, security guards offered no explanation, and seemed to have no memory of ever meeting him, despite security footage showing otherwise.
The man told the editor he was there to "ensure something was done about the One Piece situation." He said that it was crucial that he cancel the series immediately, even if it meant ceasing publication of Jump altogether. The editor refused, at which point the man closed the door to his office and locked it.
No one knows what happened during the rest of the meeting. What IS known, is that a few weeks later, that editor dropped dead during a press conference to announce the latest One Piece film. The film was ominously titled, "Dead End Adventure."