S Indushekar, 52, is accused of killing his wife, Sunitha, and six of her relatives, with their bodies recovered from locations in Karnataka and Tamil Nadu.
Rajajinagar neighbours described him as frequently quarrelsome and said he had threatened residents and claimed ownership of his rented home.
Police are probing marital tensions and a property dispute as possible motives, while examining the alleged timeline, transport of the bodies and jewellery transactions.

