I have an old Stompin' Tom version that has something close to these verses at the end, after the fair maiden has done herself in:

Now at night when I ramble
On the cliffs high above
I fancy I hear her
Sing, "Come to me, love.

"The shells of the ocean
Will be your deathbed
The fish in deep water
Will swim over your head."

I, too, will not marry
I'll not take a wife
I prefer to stay single
All the days of my life

Gives the song a whole different slant.