CervicalCheck campaigner Ruth Morrissey has died at age 39.
Her passing comes two years after she gave evidence in the High Court in her action against the HSE and the two laboratories involved the misreading of several cervical smear tests.
The High Court heard that she has not been told until 2018 about an incorrectly reported smear she underwent in 2014. The cervical abnormality led to her developing terminal cancer.
Some 221 women were affected by similar misreadings.
She and her husband Paul were awarded full damages of €2.16m as a result.
Paying tribute to the late Morrissey on Twitter, her fellow prominent CervicalCheck campaigner Vicky Phelan wrote: "Ruth was one of the strongest women I know, and also one of the most positive. I never once saw her without a smile on her face and I saw her when she was very ill.
"My thoughts today are with Ruth's husband, Paul and their beautiful daughter, Libby who Ruth adored." Phelan also confirmed that Morrissey died peacefully at Milford Hospice.
A statement issued on behalf of Ruth's husband Paul – by way of their solicitor Cian O'Carroll – said that neither the HSE nor the State ever apologised to Ruth Morrissey.
The statement said that now it was "too late" for such an apology.
President Michael D Higgins paid tribute to Mrs Morrissey, saying: "So many people across Ireland will have learned with great sadness of the passing of Ruth Morrissey.
"Ruth Morrissey's tremendous courage in an arduous campaign for truth and justice leaves a legacy of courage for all Irish people, and for those campaigning for women's right to healthcare in particular.
"Sabina and I send our sincere condolences to her husband Paul, their daughter, her family and friends, and to all those who have shared Mrs Morrissey's journey."