The body of the former Karnataka police chief, a 1981 batch IPS officer hailing from Bihar, was found in a pool of blood on the ground floor of his three-storey house in the posh HSR Layout in the city on Sunday.
Home Minister Araga Jnanendra said on Monday the police have also detained his "accomplices" for questioning.
A suspected spy from Rajasthan who was allegedly sharing photographs and details of vital installations in Bengaluru with his handlers in Pakistani intelligence agency, ISI, has been arrested, police said.
Three people were killed after police opened fire on the night of August 11 to quell a mob that went on a rampage in a city locality, irked over a social media post allegedly put out by a Congress legislator's relative.
The CCB had raided Ragini Dwivedi's residence early Friday morning after obtaining a search warrant from a court, a police officer said.
A Bengaluru-based techie killed his wife, tried to get his friend arrested, so that he could get closer to the friend's wife whom he was in love with.