Delphi murderer Richard Allen is appealing his 130-year sentence for killing two Indiana middle school girls — blaming psychosis from solitary confinement for his repeated confessions to his wife.

Allen, 54, was found guilty in 2024 of murdering eighth graders Abigail Williams and Liberty German — who were just 13 and 14 when their bodies were found in 2017 with their throats slit near a hiking trail in Delphi, Indiana.

Allen repeatedly confessed to prison guards and psychologists, as well as several times to his wife, Kathy, in person, phone calls and letters.

“I did it. I killed Abby and Libby,” Allen stated frankly in one of many phone…

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