William's middle initial is not J, but rather D.
These images can be seen at the War Cenotaph and on a link for Warren Watters that follows the monuments engravings.
After I starting writing this post I was able to find the final resting place of Warren Watters. He rests in a cemetery in Italy; Montecchio War Cemetery.
Sgt James H Watters, Sgt Warren A Watters and Private William D Watters! All members of the West Nova Scotia Regiment RCIC. I stand at attention and salute you for your service and life while protecting Canada and its allies.
THEY SHALL GROW NOT OLD, AS WE THAT ARE LEFT GROW OLD,
AGE SHALL NOT WEARY THEM, NOR THE YEARS CONDEMN,
AT THE GOING DOWN OF THE SUN, AND IN THE MORNING,
WE WILL REMEMBER THEM
Update: Received today, 3/7/2015 an image for Warren's Headstone