Usui Yoshito, the author of Crayon Shin-chan, was disappeared since he was hiking on Gunma Prefecture, on September 12, 2009.

On September 19, 2009, the police found a dead body with a clothing that matches with Usui's. We still don't know whether this dead body is Usui or not

He was found dead at the bottom of cliff in the mountain yesterday.
It is not clear whether he died as an accident or killed by himself.
So far, he went out saying that he would come back at the evening of the departure date, and there was no sign for him to be killed by himself seeing the report of news.
Anyway, it is one of the great loss for Japanese comics and animation world.