"He was signaling for years his intent."

Dr Eric Cullen is a clinical forensic psychologist who has spent much of his working life in prisons throughout the UK, including HM Prison Grendon, the therapeutic prison. Dr Cullen brings his expertise with dangerous offenders to the fore, and analyses what key areas of their lives cause our serial killers to commit murder. Here, Dr Cullen discusses Stephen Griffiths.

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Making a Monster: The Tapes features interviews recorded by Monster Films for the Crime+Investigation TV series, and was hosted by Cherry Healey, produced by Sam Pearson and Chloe Frost, with editing by Joel Porter.

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