Daily Mail U.K Police probing whether Colombian Dragons' Den star pulled from Thames 'poisoned her ex-lover's wife with thallium years before she killed schoolgirls with chocolate raspberries'
Zulma Guzman Castro is accused of killing Ines de Bedout, 14, and her close friend, Emilia Forero, 13, after they died in hospital days after eating the poisoned sweet treat.