“It is a case of double murder," stated the chargesheet filed on Monday in the deaths of Santacruz businessman Kamalkant Shah and his mother. “His wife Kajal Shah, with the help of her paramour, procured arsenic and thallium, which were used to slowly kill the mother-son duo with the intention of usurping his property,” it added.

An officer told Mid-day that "there is enough evidence to prove that both were killed with the help of arsenic and thallium procured from Punjab and Byculla with the help of some dealers."