Keiji Nakazawa, the creator of the Barefoot Gen manga series and survivor of the bombing of Hiroshima, died last month at the age of 73. He was 7 years old when the bombing occurred, and dealing with it became the focus of much of his life's and comics work. Barefoot Gen was a very widely read series, one of the first manga to be translated into English and other western languages.
The Los Angeles Times ran the best obituary for him I could find in English. Here is a list of numerous tributes and informational sites from The Comics Reporter.