Sir Roy has been struck off - though he is appealing that decision - but he is still an authority on salt poisoning
Dr Walters had concluded that "there is nothing in this case that can be explained by salt poisoning
that cannot be equally well explained by resetting of the osmostats".
Campaigners for the Gays claim new evidence has been uncovered disproving that Christian died from salt poisoning
and that, in fact, he died from natural causes.
Toddler Christian Blewitt died of salt poisoning
and head injuries in Birmingham Children's Hospital six weeks after moving to Ian and Angela Gay's.
But the 38-year-old still faces two alternative charges - both of which she denies - of assault by salt poisoning
over a four- year period or leaving the child brain damaged by her reckless conduct.
Mr Hilliard said: 'The salt poisoning
was the last event in a series designed to produce misleading symptoms in him.
Miss Macur said the couple had "inflicted two abusive episodes" - one was salt poisoning
, the other a head injury.
Asked why salt poisoning
was not considered earlier, he said: "It was, but I think the necessary steps were not taken to pursue that further.
Dr Walters had concluded that 'there is nothing in this case that can be explained by salt poisoning
that cannot be equally well explained by re-setting of the osmostats'.
He was admitted to Russells Hall Hospital, Dudley, just over a month later, on December 8, suffering salt poisoning
and brain injuries.
THE death of baby Leroy Elders from salt poisoning
is a poignant illustration of how tragedy strikes where we least expect it.
They had to abandon the blunt force trauma theory and go back to the salt poisoning