A 16-year-old girl who died on her first day at college was a victim of Sudden Adult Death Syndrome, an inquest has found.
Alison Linforth was a keen musician
Alison Linforth collapsed at her desk at Cadbury Sixth Form College in Kings Norton, Birmingham, on 11 September.
The hearing was told the reason why her heart stopped was not known as science could not yet identify a cause.
Birmingham coroner Aiden Cotter recorded a verdict of death by natural causes.
We do need to resolve it because of our daughter Gemma
Birmingham Coroner's Court was told that not even a microscopic examination of the heart revealed any abnormalities.
A pathologist told the court that between four and eight people die from the syndrome every week in Britain.
Speaking after the inquest, Alison's father John said: "Obviously it's like a sledgehammer what's gone on with our lives.
"But we do need to resolve it because of our daughter Gemma.
"You can imagine we want to wrap her in cotton wool at the moment."
Alison's parents are undergoing DNA tests to see whether a rogue gene could be to blame.