A 29-year-old man has been arrested for beating his live-in partner to death with a pressure cooker at their rented Bengaluru home, police have said. The incident, police said, took place around 5 pm Saturday when the two were fighting over the man's suspicion that his partner was cheating on him. Police said Vaishnav and Deva (24), both from Kerala, had been living together in Bengaluru for about two years. They knew each other from college and worked at a sales and marketing firm at Bengaluru's Koramangala.