Yes, it was covered by Roberta Flack. And more recently by the Fugees/Lauryn Hill.
I think all the covers of the song are good, actually. The Fugees cover is more R & B, the Roberta Flack a pop ballad, but a respectable cover nonetheless. She did it as sort of a torch song. I prefer Lauryn Hill's version, but Roberta's is still pretty good.
Is there some problem with a good song travelling into different music genres? Or is this one of those folk music nazi threads, where only "our good folk" should be allowed to cover these songs?