BJP leader and social media influencer Sonali Phogat was given recreational drug methamphetamine by accused at Curlies beach shack restaurant, said the Goa Police on Saturday.
Phogat was brought dead to St Anthony Hospital at Anjuna in North Goa district on August 23 morning from the hotel where she was staying.
While initially it was suggested that the Haryana BJP leader had died of heart attack, after her family pressed for an investigation.
Investigation revealed she had been drugged a night before her death at the popular nightclub.
The latest statement from the Goa Police came after two more persons were arrested in the murder case, taking the total number of arrests to four.
Including her manager Sudhir Sangwan and Sukhwinder Singh, the duo have been remanded in police custody for two days.
Report said that there were multiple "blunt force injuries" on her body though it reserved opinion on the cause of death pending chemical analysis.