HELP!! A Rumours song I don't know?!

[Dodfather]

Guys, HELP! I've just listened to the Story of Rumours on BBC Radio 2 (some very good interviews but nothing really new) and at the start of the show, about 5-10 mins in at the most, there was a Stevie song on in the background that is not on the album, not on the special edition cd and not one that I know well. I loved what I heard but the DJ kept damn well talking over it! The only line I can remember is "but I will die" or something like that. I know that's not much to go on but can anyone help? It was a big, proper mournful ballad....