"That is when a true example will be set, because there are so many cases in which the death sentence is given on paper but years go by after that", she said.
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The 23-year-old woman was coming home from the cinema with a male friend when a six-strong gang beat the man unconscious before raping and torturing her.
Four men were convicted in September 2013 for murder, gang rape, theft, conspiracy and "unnatural acts" after a seven-month trial in a fast-track court.
The brutality of the crime had led to nationwide street protests and changes in laws regarding sexual violence against women.
The convicted assailants have not yet exhausted all legal options - they can still seek a curative petition from the court for example - so the process may drag out for years.
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The sixth defendant, a minor accused of pulling out part of the woman's intestines with his own hand, was sent to a reform home for three years and has since been released. "The court has taken a decision against these kids (convicts) under political and media pressure", A. P. Singh told reporters.
In 2016, there were some 40,000 rapes reported in India, according to the most recent official figures available.
This included the attack on an eight-year-old girl from a Muslim nomadic community in January.
The first declaration was recorded by a doctor when she was admitted to hospital on the night of December 16, 2012 and the second on December 21 by a sub-divisional magistrate during which she gave exact details of the crime.
The gang rape sparked demonstrations attended by tens of thousands of people in Delhi and across India, which led to harsher sentences for sex crimes, including the death penalty.
Vinay Sharma, Pawan Gupta and Mukesh Singh had challenged the court's 2017 ruling upholding their death penalty. On July 9, 2018 SC will decide the fate of the four accused of death sentence in the Nirbhaya gang-rape case.
Sentencing the four in 2013, Judge Yogesh Khanna said the case fell into the "rarest of rare category" which justifies capital punishment in India.
"The convicts must be immediately hanged to death", he said.