Jealous lover accused of murdering her ex's new partner 'told victim she was still having ''unbelievably fantastic'' sex with him'

Sarah Williams, 35, (pictured left with alleged accomplice Katrina Walsh, 56) is accused of shooting businesswoman Sadie Hartley, 60, (right) in the head with a cattle prod before slashing at the mother-of-two 40 times. Today, Preston Crown Court was told that spurned Williams sent a 'spiteful' letter to Ms Hartley after her ex Ian Johnston, 57, (inset) began a new relationship with the older woman, and that when the letter failed to break up the couple, 'obsessed' Williams attacked businesswoman Ms Hartley with 'demonic savagery'.