New Delhi: Two months after the decomposed body of a man was found in a plastic bag outside a factory on Rama Road in west Delhi, police have arrested his brother and sister-in-law in connection with the alleged revenge murder.The deceased was identified as Amit Kumar (40). The suspects are Gopal (32) and his wife Soma (35).Police said the couple allegedly murdered Amit because he misbehaved with Soma.A senior police officer said, “He used to consume liquor and sought to exercise authority over her as if she was his wife. He made unreasonable demands on her and attempted to have a physical relationship with her.”Police got a PCR call about the suspicious sack at Moti Nagar police station on April 4. The body found in the sack The sack had two mattresses and two multicoloured blankets wrapped around a decomposed male body with both legs tied with a mobile charger cable.A post-mortem examination revealed multiple bruises on the neck from strangulation and an injury to the head with a blunt object. The investigation led police to an e-cart driver, from Loni in Ghaziabad. This trail led the police to Gopal and Soma.