The court said the police did not carry out the probe in a "fair and diligent manner" and asked the DCP of west Delhi to take appropriate action against the erring officials.
"In the present case, investigation is not carried out by the police in a fair and diligent manner....
"Investigation in this case is carried out in a casual manner. Copy of this judgement be sent to DCP concerned to take
The court awarded rigorous life imprisonment to 39-year- old Braham Dev, 29-year-old Ajay Bind and 31-year-old Shankar Bind, all natives of Bihar, for murdering Ram Asrey, who had tried to sort out their fight.
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According to the prosecution, the incident took place on the night of October 17, 2011, when Asrey and his wife had gone to the matrimonial house of their daughter in Nihal Vihar area in west Delhi.
The family heard some noise from outside and saw that the three accused were fighting with each in an inebriated state, it said, adding that Asrey and his daughter's father-in-law Rampal went to pacify them.
Asrey, who received grievous injuries on his head, and Rampal were taken to a hospital where Asrey died during treatment while the other victim was given medical aid.
During the trial, the trio claimed that they were innocent and have been falsely implicated in this case.
The court, while sentencing them, also imposed a fine of Rs 16,000 each on the three convicts and said, if realised, Rs 10,000 from each amount should be given to the victim's wife as compensation.
The court, in its judgment, noted that on the information received by the doctor, a case was registered by the police but no cop visited Safdarjung Hospital to record the statement of any of the witnesses.
"Even after registration of the case, IO did not visit the spot to inspect whether blood was present at the spot or not. The houses of the accused were also not searched. IO has not filed any application to any of the doctor to ascertain whether the injuries on Ram Asrey and Rampal (injured) can be inflicted with hammer, 'saria' and 'danda'," it said.