According to information at the Bob Gibson Legacy web site, BILLY COME HOME was recorded by Bob Gibson and Hamilton Camp on their album "Homemade Music" (1978), and with the title BILLY COME HOME NOW, it is also a Gibson compilation album "The Living Legend Years" (2008). At Allmusic.com, Gibson is credited as writer.

I pieced these lyrics together from a couple of sound samples:

...was too much for him, yet not enough for him.
Ev'rything felt like a lie,
And in quiet moments, an emptiness came to him.
He never knew when or why,
Only that all the vows didn't mean nothing now,
So hard to watch something die.
She said, "Billy, come home now. Keep me good company.
Ah, Billy, come sit by my side."
She said, "Billy, come home now, and keep me good company.
Can't you see, Bill, how I've cried?..."