This song was originally published by WLP in 1975 and has somehow survived time and takeovers to still be available at GIA. I found it in A Hundredfold: A Contemporary Folk Hymnal.
It is a song for Good Friday by Jack Miffleton. This is another one that Mary at Godsongs tracked down.
The sheet music can be purchased at GIA, where the text is in their preview. The words are also at this site.
You can sing along with my backing to learn the song.
There are quite a few YouTube clips so it still seems well enough known on the US. Here is a selection in varying styles and tempos.