The 21-year-old accused, Navin Goswami, stabbed his brother Jituraj (20) thrice on his back with a knife after an argument between them turned violent on Ranade Road in Dadar at 10.30 PM last night, said Deputy Police Commissioner Dhananjay Kulkarni.
Jituraj succumbed to his injuries following which Navin, who works as a manager at an ice cream parlour in Dadar, was arrested, the officer added.
Navin discovered that Jituraj had been having an affair with a married woman from Uttar Pradesh. As Navin objected to this, he called up the woman's husband and informed him about the affair, police said.
The woman's husband severely reprimanded her over the matter, and when Jituraj came to know about it, he rushed to Navin's shop last night and began arguing with him.
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The argument turned violent when Navin in a fit of rage picked up a knife and stabbed Jituraj on his back thrice on the road, causing him fatal injuries, police added.
The accused was arrested on the charges of murder by Shivaji Park police and further probe is on.