The wife of murdered pensioner Graham Buck said breaking the news of his death to her daughter was "the worst act I have ever had to carry out in my entire life".
In a victim impact statement read out to the court, Karen Buck said: "To kill him was the most senseless, vicious act of violence.
"His family, friends and I will never be able to make sense of what happened. There was no justifiable reason and we will be left with that thought, and of his pain and suffering, for the rest of our lives."
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The judge said the 14-year-old had been subject to a great injustice. He was executed for the murder of two little girls in 1944.