A "callous and cruel" woman who slit the throat of her film director sister before making off with her diamond-encrusted gold Rolex watch has been jailed for at least 22 years.Nancy Pexton, 70, was fuelled by jealousy when she launched a "ferocious" attack on Jennifer Abbott, 69, last June 10, slashing and stabbing her 10 times at her home in Camden, north London.She then taped up her mouth with gaffer tape in an "intentional act of degradation" and left her partially naked body on her sofa to r

A "callous and cruel" woman who slit the throat of her film director sister before making off with her diamond-encrusted gold Rolex watch has been jailed for at least 22 years.Nancy Pexton, 70, was fuelled by jealousy when she launched a "ferocious" attack on Jennifer Abbott, 69, last June 10, slashing and stabbing her 10 times at her home in Camden, north London.She then taped up her mouth with gaffer tape in an "intentional act of degradation" and left her partially naked body on her sofa to rot, the Old Bailey heard.