Bob Layton passed on the news.

Dear Friends & Colleagues,
It is my sorrowful duty to announce that legendary artist/editor/entrepreneur Dick Giordano passed away today.
Few could ever hope to match what he accomplished in his chosen profession, or to excel while maintaining great humor, compassion for his peers and an unwavering love for the art form.
His unique vision changed the comic industry forever and all of those who work in the business continue to share in the benefits of his sizable contributions.
I have been honored to call him a business partner, mentor and dear friend throughout the majority of my lifetime.
We will not see his like again.

Regretfully,
Bob Layton

Giordano had many roles including editor-in-chief for Charlton oversaw the creation of the Charlton heroes, which he helped bring over to DC Comics when he joined the company.  He also was an inker lending his talents to Crisis On Infinite Earths and working with Neal Adams. He was 77.