'Juarez'

Does any one know for sure who sang La Paloma in Juarez?. I have been trying to figure this out for a long time. The singer is uncredited in the listings. I have checked the credit on the actual film and it is not listed. My searches have turned up nothing credible. I can guess , that's all. All the principals are dead. The sound recording companies do not refer to the movie only to the song. Thanks in advance.