Did the "Queen of Heeley" really mean to poison her employer and sweetheart? That's the question a group of artists are exploring with a new exhibition about the life of Sheffield killer Kate Dover. The former art student and sweet shop manager was convicted of manslaughter in 1882 after facing trial for murder. In her late 20s, Dover killed 61-year-old businessman Thomas Skinner by cooking him a roast dinner with arsenic in the stuffing. He was described as her "sweetheart", whom she had