This Morning's Holly Willoughby and Phillip Schofield spoke to Dave Merritt, the father of murdered Jack Merritt on Tuesday's show.
Usman Khan stabbed Jack, 25, and Saskia Jones, 23, to death at the London Bridge terror attack last December. Jack was at a criminology conference called Learning Together, an educational course that helps to rehabilitate prisoners.
He was good friends with a man he had met on the course, named Rosca Onya, with whom Jack's father now has a special bond and Rosca even calls him "dad".
Dave said: "I first met Rosca at Jack's funeral, and we just bonded straight away really. "We have met him quite a few times since, he's been to our house and I can see why him and Jack got on so well. "You know, they just liked
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