I'm very sorry to hear this. I liked his podcasts and his writing here and had been wondering how he was doing.
Walker's creations gave me food for thought the past few years. It was because of Walker I started listening to Nico's solo albums based on a blog post he wrote about her. I also loved the song "Frozen Warnings" --where he got his username from.
I am sorry for the loss his family and friends are suffering.
What a cruel illness.
"Into numberless reflections
Rises a smile from your eyes into mine
Frozen warnings close to mine
Close to the frozen borderline
Over railroad station tracks
Faintly flickers a modest cry
From without a thousand cycles
A thousand cycles to come
A thousand times to win
A thousand ways to run the world
In a similar reply
Friar hermit stumbles over
The cloudy borderline
Frozen warnings close to mine
Close to the frozen borderline"