A Scottish nurse called the angel of death after he was found guilty of six months of killing Spree could be the victim of a judicial miscarriage, a forensic scientist claimed.
Colin Norris was imprisoned for 30 years for the murder of four pensioners and the attempted murder of another in hospitals in Leeds, Yorkshire, by injecting them with insulin.
But an expert in forensic toxicology has now evoked new doubts about the conviction and said he believed that Norris was found guilty of poor evidence.
The case has long been examined and the newest claims draw parallels with nurse Lucy Letby, who sits out 15 whole lifelong penalties for killing seven babies and tries to kill seven others between 2015 and 2016.
Profile Alan Wayne Jones, a retired expert in forensic toxicology, said that he saw 'close parallels between' the Letby case and that of Norris.
He said, “It is absolutely possible that Colin Norris and Lucy Letby can be released on appeal from these crimes, given the weight of evidence that could be collected to undermine the methodology in these tests.”
Letby has already lost two bids to appeal, but a panel of medical experts has challenged the evidence against her.
In the meantime, Norris, 48, could be released in May when the Court of Appeal in London Conscires that evidence against him was largely indirect and deeply inadequate.
Colin Norris, born in Glasgow, was imprisoned for 30 years for the murder of four pensioners and the attempted murder of another in hospitals in Leeds
Bridget Bourke, one of the four older women murdered by Norris
Profs Jones has written a paper who claims that crucial and stressful tests in the Norris case do not meet forensic standards.
And he agrees with many experts that hypoglycaemia, which inexplicable low bloody sugar, which associated the death of the victims in the Norris case, can act more often than was thought of at the time of his trial, making a clear reasonable doubt for The conviction was created.
Doubt about the conviction has long been left, with professor Richard Marks being doubts about the culprit of Norris 14 years ago as part of a BBC documentary.
Profs Jones told The Daily Record: 'Marks discovered the only real evidence in the case of Norris that insulin was used in the death of one of the dead of the older ladies – Ethel Hall.
'For the other four cases there was no chemical or forensic evidence against him, just that he happened to be in service when these older ladies died.
'And when they died, they were diagnosed with Hypoglycaemia and because Norris was already suspected in the Ethel Hall case, they were looking for the hospital rota and discovered that he was in service when his other ladies died and they had hypoglycaemia.
“The prosecutor brought together two and two and accused Norris to kill these other ladies. There is sufficient evidence to suggest that he received a rough deal. '
A new BBC documentary reveals new proof that the road could pave the release of Norris
The expert said that Mrs. Hall's blood sample was analyzed with the help of immunoassays, but that is not sufficient for reliable forensic evidence.
Profs Jones also said that a care was created when Mrs. Hall's blood sample was tested on insulin and a connection called C -Peptide.
He said: 'They had already normalized Mrs. Hall's blood sugar level by giving her intravenous glucose – and that disturbed the results.
'The Laboratory in Surry was a clinical and not a forensic laboratory, and there are stricter routines in forensic science compared to clinical science, so you must have a completely different standards of things such as Chain or Custody, Storage or Specimen, Stability of the stability of the medicine.
“So there are problems with the evidence that makes me conclude that this conviction is unsafe.”
Norris, who grew up in the part of Glasgow and studied at the University in Dundee, was convicted of Newcastle Crown Court in 2008.
He has the right to appeal after a long fight.
His case will be heard in May by judges of the Court of Appeal and this is expected to last up to four weeks.
