32 year old Keith Wong has an obsession with breast milk due to some childhood trauma (another story for another time). And he wants 'virgin breast milk' meaning milk not drunk by anyone before. That means he has to get the milk from pregnant women who are near their due dates. He would thus break into their homes when they are alone, strangle them to death then use a breast pump to pump out their milk as they have not started lactating yet. He would then enjoy a nice bottle of warm milk before leaving.