I need help finding a movie!!?

i saw this movie when i was a little girl and tills this day im still trying to look for it.. the movie is about a guy that helps this lady that they are killing her people and in the end they find her kill her, and he stays with her baby! i know she also sings him a lulluby and at the end he finds a women that signs him the same song!! please help me find this movie!! i know Bruce Willis is in it!!