Holly Hagan-Blyth: 'I hope we can use Darci's story to educate my son about drugs' Holly Hagan-Blyth lost her 19-year-old half-sister, Darci, in October 2025 after she accidentally overdosed on crystal MDMA and suffered two cardiac arrests, and Holly hopes to use Darci's story to te 27 April 2026 Holly Hagan-Blyth hopes to use her half-sister's death to teach her son about the dangers of drugs.