An out-of-hours doctor who killed a Cambridgeshire pensioner with a fatal overdose was "blissfully unaware" of his actions, a hearing has been told.
Daniel Ubani injected 70-year-old David Gray with 10 times the recommended daily dose of diamorphine at his home in Manea, Cambridgeshire, in 2008.
The General Medical Council (GMC) heard the 67-year-old locum only knew of the death by phone call the next day.
In Germany Ubani was given nine months suspended for death by negligence.
It is understood he cannot be tried in the UK because of double jeopardy laws.
Given wrong medication
Bernadette Baxter, prosecuting, said Dr Ubani continued to treat patients after Mr Gray.
The GMC is also looking into Dr Ubani's treatment of two other patients on the same day.
Sandra Banks, 59, who was given the wrong medication for a migraine, and Iris Edwards, 86, who was found dead in her care home a few hours after he treated her.
Dr Ubani visited Ms Banks before Mr Gray and failed to ask about her medical history, did not properly examine her, and did not stay to check she was OK or make any notes, the panel was told.
He injected her with painkillers which made her condition worse and left the syringe in her bedroom.
She was later taken to hospital in an ambulance after her condition deteriorated, the panel heard.
After visiting Mr Gray, Dr Ubani then visited Ms Edwards in her care home in Ely, Cambridgeshire but the decision was taken not to send her to hospital even though her heart was racing and she had low blood pressure.
She later died of a heart attack and coroner recorded a verdict of natural causes as it was unclear if she would have lived had she gone to hospital, the panel was told.
Dr Ubani had flown into the UK the day before and only had a few hours sleep before starting a 12-hour shift, the panel heard.
He was working for SuffDoc, part of the out-of-hours GP service provider Take Care Now, for £45 an hour.
The evening before he started the shift, he was given several hours' training on the firm's computer system at its headquarters in Colchester, Essex, the hearing was told.
He was also given an induction by a doctor who expressed concerns that Dr Ubani had no experience of working for the NHS, did not know the area, and had not received sufficient training.
But his report was not read until two days after Mr Gray's death.
Mr Gray's family have recently accepted £40,000 compensation from sources which remain confidential as part of the pay-out agreement.
In February a coroner ruled Mr Gray had been unlawfully killed.
The GMC has the power to order Dr Ubani to be struck off the medical register which would prevent him from working as a doctor in the UK.
In a letter to the GMC ten days after the death of Mr Gray, Dr Ubani said he was "very, very sorry and confounded".
"The remorse and guilt will live with me the rest of my life," he wrote.