animationmagazine.net/article/11990
RIP 
RIP Mr Witkin. Your legacy will live on in the upcoming Brave.
RIP. Did he die today? One of my little brothers old teacher’s husband also died today.
Aww sadface! That’s too bad. He was certainly a help with Pixar’s innovations to animation.
Wow, he seemed like a huge contributor to the studio, and his death is a real tragedy. Rest in peace.
R.I.P He made some wonderful contributions to Pixar. An innovator.
R.I.P Thank you for your amazing contributions to the field of animation.
My condolences to his friends and family. His legacy will certainly live on in Brave and the other Pixar films he contributed towards.
Condolences to the Witkin family. His presence at the studio and to the fans will be sorely missed.