From Terry's Wikipedia Page, a beautiful, moving and poignant tribute from his assistant Rob Wilkins:

 

'After Pratchett's death, his assistant, Rob Wilkins, wrote from the official Terry Pratchett Twitter account:

 

AT LAST, SIR TERRY, WE MUST WALK TOGETHER.

Terry took Death's arm and followed him through the doors and on to the black desert under the endless night.

 

The End.'