Jacqui Kirby – the mother of a girl who was raped and then strangled to death in 1983 – told ITV News Central in 2010, that she wants to inflict on him what he inflicted on her 16-year-old daughter.
Paul Stewart Hutchinson was jailed for the killing in 2010.
A commemorative plaque is being unveiled in Keyworth in Nottinghamshire today, to mark 30 years since the murder of Colette Aram.
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Janet Ajao said in a statement: "I do not condone his actions nor support the beliefs he held that led to him committing this atrocity."
Sonia Bryce played 'Shape of You' at top volume and cause a "wholly unacceptable level of disturbance" according to a judge.
They will be joined by Duke Dumont and Disciples at this year's festival in Staffordshire.