Here is my best candidate (until I can speak to my friend):
Theodore Dubois, “The Seven Last Words of Jesus Christ” [Latin, 1867; English, 1899].
The opening solo is for soprano, and appears to match your description.
If you go to either of the below sites, then you should find a detailed delineation of the piece:
http://www.fbcmalden.org/about-us/special-events/seven-last-words-christ-theodore-dubois-1867/
THAT’S IT!!!!!!!!!!!!
Infinite thanks! Now I can try to look up a recording. Fantastic!