DELPHI, Ind. -- The Delphi Murders case is going to the court of appeals.

ABC57 obtained court documents that show oral arguments for Richard Allen's appeal against his murder convictions will begin Monday, September 21.

Allen officially appealed his murder convictions this past December, one year after he was sentenced to 130 years in prison. He was found guilty of the murders of 13-year-old Abigail Williams and 14-year-old Liberty German, whose bodies were found near the Monon High Bridge Trail in Delphi on Valentine's Day, 2017.  

Among his attorneys' reasons for filing appeal were arguments that the document that led to the search of Allen's home and his eventual arrest contained mischaracterizations of witness statements. His attorneys also argued that the 13 months Allen spent in solitary confinement made his eventual confession unreliable due to "psychological coercion."

Finally, his attorneys argued that Allen's rights were violated because he was unable to present a complete defense. One of the initial police sketches after the murders, which they say looks nothing like Allen, was prohibited from trial. Allen was also unable to offer his alternate theory of events that Odinists actually committed the murders as a ritualistic killing.  

The state, in its response filed by the Indiana Attorney General's office, refutes all these claims and maintains the trial was proper.