A Perth teenager has avoided a life jail term for murdering a stranger who was trying to help a 10-year-old boy recover a bike that had been stolen from him, and instead been sentenced to a term of eight-and-a-half years in juvenile detention.
The teenager was 15 in May last year when he used an 18-centimetre filleting knife to fatally stab 42-year-old Petr Levkovskiy on a Sunday morning in the southern Perth suburb of Bull Creek.
