Kiwi euthanasia attorney now faces the second charge of the murder of a disabled person.
According BBCSean Davison appeared at the Cape Town Court on Friday in two murders. Fees that denies.
A 75-year-old forensic scientist founded the legal organization DignitySA.
Davison is now accused of killing Justin Varian & # 39; and by putting the bag on his head and administering helium, BBC reports.
Varian died on July 25, 2015. A few years earlier he was diagnosed with a motor neurone disease.
Davison has already been charged in connection with the death of friend Anrich Burger, 43, 2 November 2013.
Burger has become a four-zloty after a car accident.
Born in Auckland, Davison moved to South Africa in the early 1990s and became a professor of biotechnology at the Western Cape University.
Davison earlier hit the headlines in New Zealand when he was convicted of the death of his 85-year-old mother who had a terminal cancer.
Archbishop Desmond Tutu wrote to the judge with a request for leniency and gave Davison a reference to the characters: BBC reports.
Davison was under house arrest for five months after he confessed to the suicide of his mother before returning to South Africa in 2012.
He is now released on bail and is due to appear again in court on January 29.
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