If you do hg log myfile -v you see a list of changesets that the file was modified in.
hg log myfile -v
In our case, in the most recent changeset, the file was removed. But
The --removed flag should get you what you are looking for:
--removed
hg log myfile -v --removed
From the help for hg log:
hg log
--removed include revisions where files were removed