The Missouri Supreme Court has ruled that the attorney general can appeal a ruling that vacated Christopher Dunn’s conviction.

Dunn, who was exonerated for a wrongful murder conviction and has maintained his innocence, spent 34 years in prison. The court ruled 4-3 on Tuesday to return the case to the appeals court, in a decision written by Judge Ginger K. Gooch.

Dunn’s case followed the 1990 fatal shooting of 15-year-old Ricco Rogers in the Wells-Goodfellow neighborhood. The conviction was primarily based around the testimony of two boys who later recanted and said prosecutors and police officers had coerced them to make their statements.

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