The court also imposed a fine of Rs 17,000 each on Sunil, Harish and Madan after holding them guilty for various offences including under sections 302 (murder) of the IPC.
"I am of the opinion that prosecution has proved every link in the chain of circumstantial evidence that the deceased having been brought to her matrimonial home was murdered by the accused persons," additional sessions judge Vijay Kumar Dahiya said.
Sunil also confessed that Harish and Madan planned the murder and strangulated her using a rope and threw her body in a nearby canal, police said, adding both the co-accused were apprehended and they too confessed that Monika was murdered.
Police later recovered Monika's body from the canal.
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Police also told the court that the three accused had given disclosure statements about the murder. During the trial, the accused, however, denied all the incriminating evidence against them and claimed they were falsely implicated in the case.
The defence counsel contended that the prosecution's case was full of "material contradictions" and vital discrepancies were there in the depositions of the prosecution witnesses.
It also observed that the body was recovered on the basis of the joint disclosure statements of the trio and Sunil was having a motive to eliminate his wife as his in-laws were not fulfilling his demand.
"At the very outset, the (three) convicts committed murder of the deceased, who was wife of one of the accused persons... The death in this case was caused due to strangulation," the court said.