The CB-CID which handled the investigations initially filed a status report before the court today.
Mobile shop owner Jeyaraj and his son Bennix were arrested by police in Sathankulam town in Thoothukudi district for allegedly violating the lockdown on June 19.
The father-son duo was allegedly tortured during police custody leading to their deaths three days later.
After the Madurai Bench took suo motu cognizance of the case, 10 policemen have been arrested so far.
Meanwhile, Covid-19 has struck the ongoing probe with seven sleuths from the CBI and two accused policemen from the Sathankulam police station testing positive for the novel coronavirus.