A couple convicted of killing a three-year-old boy are hoping to clear their names using new evidence that the youngster may have had a rare form of diabetes, it has emerged.
Ian and Angela Gay were both jailed for five years earlier this year after being found guilty by a Worcester Crown Court jury of the manslaughter of Christian Blewitt.
Prosecutors claimed the couple, from Halesowen, had poisoned Christian - who they hoped to adopt - with salt.
But a BBC investigation into the case has found that Christian could have been suffering from a rare form of diabetes, which affects salt rather than sugar levels.
Professor Ashley Grossman, of Barts Hospital, London, told the BBC: "On the basis of the data that I've seen, I just cannot see how you can exclude that diagnosis.
"Although it's a rare condition, the deliberate harming of a child by giving them massive amounts of salt, on a single occasion, seems to me an even more bizarre occurrence."
Christian died in hospital in December 2002 after falling unconscious at the Gays' former home in Bromsgrove, Worcestershire.
The couple's case featured in BBC Radio 4's File on 4 programme last night and on BBC Two's Newsnight programme.