The West division police on Sunday night arrested slain former councillor Rekha Kadiresh’s sister-in-law Mala and her son Arul in connection with the murder.
With this, seven persons have been arrested so far and efforts are on to track down others involved in the murder.
According to the police, Mala and Arul are the prime accused in the case.
Their names cropped up after the police grilled Peter, Surya, Stephen, Ajay, and Purushotham, who were arrested soon after the murder on Thursday.
Former Bruhat Bengaluru Mahanagara Palike (BBMP) councillor Rekha Kadiresh was hacked to death by armed men outside her office near the flower garden in Cottonpet on June 24 around 10.30 a.m. The two-time BJP councillor from Chalavadipalya was supervising distribution of relief material and breakfast when the assailants struck.
She was rushed to Kempegowda Institute of Medical Sciences (KIMS) where she succumbed.
A senior police officer said, “It was a planned murder. The assailants had turned away the CCTV cameras installed outside the office. We suspect that the assailants were known to her and were aware of her routine.”
Three years ago, in February 2018, her husband Kadiresh S., a rowdy-sheeter, was hacked to death near Muneshwara temple in Chalavadipalya.
