One of the great men I have met.  A sad day.  Nowadays 70 seems so young.  Because of his and Ken Thompson's creation of UNIX, I am where I am today….

From the CNET article:

Dennis Ritchie, an internationally renowned computer scientist who created the C programming language, has died at age 70.

Ritchie died at his home over the weekend, according to a Google+ post from longtime colleague Rob Pike. His Wikipedia entry was updated to say he had died in Murray Hill, N.J.

His death was confirmed today by Bell Labs, in a message from its president, Jeong Kim, to employees. That message reads, in part:

Dennis was well loved by his colleagues at Bell Labs, and will be greatly missed. He was truly an inspiration to all of us, not just for his many accomplishments, but because of who he was as a friend, an inventor, and a humble and gracious man.

In addition to being the creator of C, Ritchie co-authored "The C Programming Language," commonly referred to as K&R (after the authors, Brian Kernighan and Ritchie) and widely considered the definitive work on C. He also made significant contributions to the development of the Unix operating system, for which he received the Turing Award in 1983 (along with Kenneth Thompson).