The teenager, who cannot be named, was originally accused of murdering Dawn McKenzie, 34, a former nursery worker, but prosecutors accepted a guilty plea to the lesser charge of culpable homicide on the grounds of diminished responsibility.
The High Court in Glasgow heard that in the days leading up to the killing, the boy’s Xbox, mobile phone and laptop taken away from him.
Psychiatrists who examined him said he was unable to control his behaviour at the time.
Mrs McKenzie was stabbed ten times to the head and body.
The fatal blow severed a major blood vessel and caused her to bleed to death.
The court heard the nature of some of her injuries revealed that she had fought for her life. Read More
The boy, who was just 13 at the time, stabbed Mrs McKenzie in Hamilton on 24 June, 2011.