A 26-year-old man has been arrested in north Delhi for allegedly murdering his mother following a quarrel after she refused to give him money to buy liquor, police said on Sunday.Police said the man slit his mother's throat in north-west Delhi's Vijay Nagar area after which he surrendered before the police on Saturday night.The accused has been identified as Deepak who allegedly slit his mother's throat with a kitchen knife following a quarrel."The accused Deepak surrendered before Model Town police station around 1.25 a.m. and reported that due to some quarrel he slit the throat of his mother Asha Devi. A team rushed to the spot and Devi's body was recovered. One bloodstained knife along with bloodstained bed sheet, and pillow and the bloodied jeans and T-shirt of Deepak were found at the house. Devi's body was shifted to BJRM hospital for post-mortem," said Vijayanta Arya, Deputy Commissioner of Police (North west).A case of murder was registered and Deepak was arrested."During investigation, Deepak disclosed that he had demanded money from his mother for liquor however after she refused, a quarrel broke out between the two and he allegedly slit her throat with a kitchen knife. He also disclosed that he suspected his mother was having an illicit affair," said Arya.Police said that Deepak was unemployed while his mother was a househelp. Deepak lived with his mother and younger brother. His brother had gone to a nearby market at the time of the incident.