Author. He was a British writer of unsolved crime. Born David Anthony Yallop in London, England, he is best remembered for his book, "Beyond Reasonable Doubt?" (1978). The work tells the story of New Zealand farmer Arthur Allan Thomas who was convicted and later pardoned for the murders of his neighbors Harvey and Jeanette Crew. In 1982, the book was made into a docu-drama feature film directed by John Laing and starred Terence Cooper, Roy Billing, John Hargreaves, Martyn Sanderson, Tony Barry, and David Hemmings. His other writings include, "To Encourage The Others" (1971), "The Day The Laughter Stopped" (1976), "Deliver Us From Evil" (1981), "In God's Name: An Investigation Into The Murder of Pope John Paul I" (1984), "To The Ends Of The Earth: The Hunt For The Jackal" (1993), "How They Stole The Game" (1999), "Unholy Alliance" (1999), "The Power And The Glory: Inside The Heart Of Pope John Paul II's Vatican" (2007), "Beyond Belief: The Catholic Church And The Child Abuse Scandal" (2009), and "Ratlines" (2010). He also was a co-author of Monty Python comedian Graham Chapman's autobiography, "A Liar's Autobiography, Volume VI" (1980), which featured a fictionalised account of Chapman's life. In addition, he also worked as a screenwriter, having wrote scripts for many BBC comedy shows, 10 episodes for the ITV court drama, Crown Court, and several episodes for the long-running BBC soap opera, "EastEnders". He was released from the "EastEnders" for suggesting that several characters on the show be killed by an IRA bomb. He later sued the BBC for breach of contract and won. His honors include winning the CWA Gold Dagger for Non-Fiction. He continued writing until he became ill. He passed away in his native London after suffering from Alzheimer's disease for many years.