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Larry Teeple said he still thinks about the case all these years later, still believing, as he did from the moment he discovered Ingrid was missing, that the case was somehow not random.
"It never made sense to me that they would be able to conceal their crime for 45 years if it was totally random," he said from his Tottenham home.
Courtice said the case will never be personal for him, but did say he was moved by the emotion Oscar displayed when the men met before his passing.
"It was clear to us, that for Oscar this crime was very fresh and he was still trying to process it."
For Athwal, dedicating himself to cold cases is a challenge, having read through each of York police's 51 cold cases seven times.
"This type of case tests your perseverance, dedication and your patience," Athwal said.
During the original investigation there were five suspects, all interviewed and their names cleared, confirmed through alibis.
One officer told Brent he thinks the best chance to find Ingrid is a deathbed confession.
For a crime that shook Oscar "to the very core of his being," according to Brent, it may be the only way he is ever be able to truly rest in peace.