Wynonna Judd is speaking out for the first time since her mother Naomi Judd died by suicide in April at the age of 76. The 58-year-old country singer opened up to "CBS Sunday Morning" in an interview set to air this Sunday about her late mother's long battle with mental health issues. "I did not know that she was at the place she was at when she ended it. Because she had had episodes before and she got better. That's the challenge with mental illness. It's really, really mysterious," she said.