This is not the first time that a mercy killing demand has gone to the courts.
There have also been several homicides with propofol, including "a mercy killing" in a hospital, he testified.
It is being seen as a landmark case in India where euthanasia or mercy killing is illegal.
Butler said she did not see anyone perform a mercy killing, and she said because of her personal beliefs, she would never have participated.
Both the hospital authorities and the Andhra Pradesh high court refused his request to turn off his life support system, saying that would amount to an illegal mercy killing.
The Homicide Review Advisory Group said a so-called mercy killing attracted the same mandatory life penalty as serial killings and it said it wanted sentencing for murder to be discretionary.
Earlier the Homicide Review Advisory Group said a so-called mercy killing attracted the same mandatory life penalty as serial killings and it said it wanted sentencing for murder to be discretionary.
Mr Lamb's lawyers are "seeking to create a new defence to murder, which would mean that a doctor involved in a mercy killing would have a defence to a murder charge", they say.
About three hours later, King said, the second-floor triage area where he was working was cleared of everyone except patients, a second hospital administrator and two doctors, including the physician who had first raised the question of mercy killing.
Former Newcastle GP Dr Dave Moor was investigated further by the GMC despite his acquittal following allegations he carried out the "mercy-killing" of a terminally-ill patient.
Prosecutors say the shooting happened after the couple got into an argument and allege the killing was deliberate, carried out with no mercy.
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