A 28-year-old man was arrestedfor allegedly killing his younger brother for stepping out of their home during the COVID-19 lockdown in the western suburb of Kandivali, police said on Thursday.Rajesh Laxmi Thakur killed his younger brother Durgesh after the latter stepped out of the house despite repeated warnings about the lockdown on Wednesday night, an official from Samta Nagar police station said.The deceased, who was working in a private firm in Pune, had returned home following the coronavirus scare, he said.When Durgesh got back home after his outing, the accused and his wife shouted at him and a heated argument ensued, following which the accused attacked him with a sharp object, the official said.The victim was rushed to a nearby hospital where he was declared dead on arrival, he said, adding that a case of murder has been registered against the accused.