"The appeals are without merit and are accordingly dismissed," a bench of Justices Reva Khetrapal and Sunita Gupta said while upholding the life term of Parveen, Anil, Gulab Singh and Anil Kumar.
The four hail from a locality in north-west Delhi.
The court also rejected the plea of the convicts that they did not intend to kill and hence, the murder charge be substituted by milder one of culpable homicide not amounting to murder.
"We are, therefore, unable to persuade ourselves to interfere with the judgement of the trial court by altering the conviction under Section 302 (murder) IPC to one under Section 304, Part I or Part II (culpable homicide not amounting to murder) of the IPC," it said.
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When Rajesh and Vikas tried to stop them, the four accused fatally attacked the victim with a wooden stick and knife.
Vikas, who also was injured, fled to inform his family members. Rajesh later succumbed to his injuries at a hospital.
"The sequence of events as unfolded by evidence of the witnesses and the documentary evidence on record, in our considered opinion, cogently and conclusively establish the guilt of the accused," the court said.