Carmel Sparke and AAP A GP in the UK has pleaded guilty to an audacious plot to kill his mother ’ s partner with a fake COVID-19 vaccine .

Dr Thomas Kwan had originally sent his mother , Wai King , and her partner a fake medical letter saying they were due for a health check .

He later turned up on their doorstep wearing a wig , fake beard and a community nurse o u t fi t .

During the house call , he managed to take his mother ’ s blood pressure before administering a poison to her partner , Patrick O ’ Hara .

Mr O ’ Hara survived the attempted murder but required extensive treatment for necrotising fasciitis , including skin grafts .

Prosecutors claimed Dr Kwan was concerned about his mother ’ s will , which provided that her house would be inherited by Mr O ’ Hara if he was still alive when his mother died .

Several files regarding poisons to kill a person and ideal poisons to use to evade detection were also found on his computer , police said , with a search of his home uncovering multiple chemicals and toxins .

It was initially thought that Dr Kwan had used ricin on Mr O ’ Hara .

However , scientists concluded it was most likely a pesticide called iodomethane ,

which was found in a syringe and would have resulted in Mr O ’ Hara ’ s symptoms , although the toxin had never previously been used on a human , according to a BBC report .

Initially , Dr Kwan pleaded not guilty to attempted murder but admitted a charge of administering a noxious substance .

Shortly after the trial began , he changed his plea . Northumbria Police

Detective Chief Inspector Jason Henry added : “[ Dr ] Kwan ’ s actions were utterly despicable .

“ He used his experience as a doctor to deceive the victim into thinking the medical appointment he had arranged was genuine before administering the poison , which has caused him unimaginable pain and suffering .”

Dr Kwan is due to be sentenced at a later date .

Dr Thomas Kwan and ( right ) his disguise .

‘ He used his experience as a doctor to deceive the victim .’

“[ Dr ] Kwan used his encyclopaedic knowledge of , and research into , poisons to carry out his plan ,” Prosecutor Peter Makepeace had told jurors . “ That plan was to disguise himself as a community nurse , attend Mr O ’ Hara ’ s address — the home he shared with the defendant ’ s mother — and inject him with a dangerous poison under the pretext of administering a COVID-19 booster injection .”

Dr Kwan had originally sent the couple , both in their 70s , the forged medical letters with the NHS letterhead back in January this year .

He then travelled to Newcastle the night before the home visit , using fake number plates on his car and checking into a hotel under a false name .

As soon as the injection was given , Mr O ’ Hara said he felt a “ terrible pain ”. Dr Kwan then made a swift exit , the court had heard .

In the hours that followed , Mr O ’ Hara became seriously unwell : first visiting his GP before being admitted to hospital .

He showed the bogus medical letters to hospital staff , who confirmed they were fake .

When police visited the GP ’ s home , they discovered he had downloaded onto his computer a ‘ poisoner ’ s handbook ’ and a book on guidance for murder investigations .