A special bench of justices Gita Mittal and J R Midha said just because the conviction rested on circumstantial evidence was not a sufficient ground for not imposing the death sentence and the trial judges have "misdirected" themselves.
"We find that the trial judges have considered each of the circumstances pointed out by the defence singularly and not examined these circumstances cumulatively to impose an appropriate sentence. This is contrary to law.
Vikas and Vishal Yadav were found guilty by the trial Court and awarded life sentence on 30 May 2008.
Third convict Sukhdev Pehalwan, who was absconding for three years after the crime, was separately tried and sentenced to life by a Delhi another trial court judge on July 12, 2011.
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The High Court said medical evidence revealed that only a single injury resulted in death of Nitish and this fact was taken as a "mitigating circumstance" by the trial judges, is completely unacceptable.
"The surrounding facts and circumstances of this case have also not been considered. The single blow has been dealt with in isolation and treated as a mitigating circumstance which is contrary to law and erroneous in the facts and circumstances of this case," the bench said.