The Court of Criminal Appeals also ruled Wednesday that David Cloar cannot be required to receive psychiatric treatment upon his release, The Knoxville News Sentinel reported.
Cloar, a 35-year-old Vietnam veteran at the time, was found not guilty by reason of insanity after killing Jack Cloar and June Cloar with a knife at his father's Morristown home.
Officials at the Middle Tennessee Mental Health Institute have called for Cloar's release for the past 15 years, arguing that Cloar's psychotic symptoms, including his obsession with religion, have been kept in check with medication.
The appellate court's ruling reverses one by 3rd Judicial District Circuit Court Judge Thomas Wright last year. Wright said he was troubled that the facility's aftercare plan would not require mandatory outpatient treatment or any supervision to ensure Cloar continues to take his medication.
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"You know whose face is going to be on '20/20' if he goes out and puts a knife in somebody else? It's going to be his face and my face," Wright said at last year's hearing. In an opinion authored by Judge D Kelly Thomas Jr, the appellate court said the applicable state law includes no such requirements of mandatory treatment after release.
Prosecutors have 60 days to ask the Tennessee Supreme Court to review the decision.