The wife of James Hughes, described the suffering the family had gone through in a victim impact statement:
For three years we have struggled to discover and then accept the truth of what happened to Jim. The world does not stand still but for us we have been subjected to a tortuous purgatory that can only be brought to an end by truth and justice.
Our trust in normal processes, authorities and structures of society was shattered by the inexplicable, callous and deceitful actions of the medical profession entrusted with the most basic responsibility to protect human life.
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Mr Gard and Miss Yates want to spend the final hours with their son at home in Bedfont, west London.
A ninth penguin was injured.
The animal killer is thought to have killed more than 250 creatures and has now been linked to the mutilation of a deer in south Croydon.