The two lovers accused of murdering Santacruz-based garment businessman Kamalkant Shah, had researched about toxic elements—arsenic and thallium—online, before procuring the poisonous substances from their contacts for the crime, Mumbai police’s Crime Branch officials told mid-day. Sources added that because the elements were tasteless and odourless, they were unidentifiable by the victim when diluted in his drinking water. The toxic chemicals cause slow poisoning.

Accused Kajal Shah, wife of the victim, and her boyfriend Hitesh Jain, had done a thorough research to eliminate the businessman without leaving any trace behind, preliminary investigation revealed.