One other person – a child – is battling for her life in hospital.
Police said that those killed are Simone “Ngina” Price, 36, her husband, Alex Blair, 42; her seven-year-old son Jahaquel Blair and her best friend, Natasha George, 36.
Price’s elder son, Jamal Waterman, 12, is in a critical condition at the Georgetown Public Hospital.
Police are working on the theory that the bottles of a multivitamin tonic had been handed to the family to be sent to the United States. However the person to whom the bottles were handed were unable to carry them because she was not visiting another relative in New York.
The police in a statement issued Sunday night said that the family ingested SSS Tonic into which a quantity of cocaine had been dissolved.
It said that the bottle of SSS Tonic, along with other goods had been left at the house by a man known to them for an overseas-based female relative to take with her on her return.