WATCH: Sinéad O’Connor, Irish singer-songwriter famous for “Nothing Compares to You” dies at 56

Sinéad O’Connor, the Irish singer-songwriter most famous for her 1990 single “Nothing Compares 2 U,” has died. She was 56. CBS News’ Imtiaz Tyab speaks with O’Connor’s biographer, Allyson McCabe, who explains that the song, written by Prince, turned the singer into a global superstar. But O’Connor was as controversial as she was talented.