Cassius Bell

Cassius Bell was a wizard who had an affair with Albus Dumbledore, when he was married to Sheila Rookwood. The jealous Sheila killed Cassius, and he became a ghost. When Albus fell in love with Minerva, Cassius became jealous, and therefore he tried to kill Minerva, but he failed. The ghosts of Dinah, Anita, Lisa and Cassius kidnappe Sheila when she tried to kill Harry Potter and Hermione Granger. The four ghosts want to kill Sheila as revenge for her killing them in the past, but Sheila manages to escape.