Where can I find any information on Roy L. Daly who was in the navy in WW1. He was on board the CD20 and Niobe

Question

He was in the Canadian Navy.

Answer 1

he is NOT listed in the following:
http://www.comradesandcolleagues.com/CANADIAN_NAVY/HMCS_NIOBE.asp

CD-20 was a minesweeper:
http://www.hazegray.org/navhist/canada/ww1/cd/

Answer 2

I would suggest contacting the Canadian consulate and asking them to trace his service in the Canadian Navy and seeing whether he is still alive.
:)