Singer Bernie Nolan was first diagnosed with breast cancer in April 2010.
She received the all-clear in 2012 after a mastectomy and extensive chemotherapy.
But later that year her cancer returned, having spread to her bones, brain, liver and lungs.
Her husband Steve finished her memoir Now and Forever in early 2013 when she became too ill to finish the book.
She died peacefully on Thursday morning surrounded by family members, a spokesman said.
More top news
The former BBC journalist will also present a new political programme 'Peston on Sunday'.
Patients needing orthopaedic surgery in Wales will be asked to lose weight and give up smoking as NHS struggles to cope with waiting lists.
Heavy showery rain will continue to push northeastwards across the north of Britain during the rest of today.