Austria's highest court on Wednesday ordered a new trial for a schizophrenic teenager sentenced to 13 years in jail despite conflicting expert evidence at his trial for the murder of a seven-year-old girl.
The boy, 16, was convicted last December of strangling and trying to decapitate his neighbour, who was playing video games at his home, before leaving her body in a waste container.
The teen said he had been directed by "voices". 
The court found he could be held criminally responsible for his actions, even though two expert witnesses gave contradictory opinions on this point.
Judges had rejected calls by prosecutors and the defence for a third opinion, which the Supreme Court said Wednesday is indeed required. It ordered a retrial.
The maximum sentence for this type of crime and an offender so young is 15 years.
The court in December ordered the boy to be transferred to an "institution for mentally troubled offenders" to serve his sentence.
The teen, who had no prior convictions, committed the crime in Vienna in May last year.