Speaking to PEOPLE in 2013 about her revealing memoir, 'Remembering Whitney,' Cissy Houston reflected on the star's tragic death.

The two-time Grammy winner was in the well-known vocal group, the Sweet Inspirations, with Doris Troy and her niece Dee Dee Warrick.

Soul singer Cissy Houston, who was also known as the mother of pop icon Whitney Houston, died Monday morning, according to reports. She was 91.