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Mone was born in Dundee and grew up with his parents and two sisters. He claims to have had a dysfunctional home life and traumatic childhood; his father, Robert Christopher "Sonny" Mone, would become a multiple killer after the younger Mone, being sentenced to life imprisonment in 1979 for the murders of his aunt and two other women in Dundee, before dying in a knife attack in Craiginches Prison in 1983. In 1964, Robert Francis Mone was expelled from St John's RC High School. He then joined the Gordon Highlanders and served with them in West Germany. He returned to Dundee with depression and began to drink heavily.
On 1 November 1967, armed with a shotgun, Mone entered a girls' needlework class at St John's School. He subjected the 14- and 15-year-old pupils and their pregnant teacher, Nanette Hanson, to a 1½-hour ordeal, before shooting Hanson dead, raping one girl, and sexually assaulting another.
Mone, whose motive was apparently revenge for being expelled from the school three years prior, was found to be insane and sent to the State Hospital for Scotland and Northern Ireland in Carstairs.
In 1976, Mone broke out of Carstairs Hospital with fellow inmate, Thomas McCulloch, murdering another inmate and a male nurse in the process and also killing a police officer. They were eventually captured near Carlisle where four Scottish police vehicles were joined by reinforcements from Cumbria Constabulary; the fugitives were forced onto a slip road while trying to move back ahead of police who had overtaken them, and crashed. Despite the crash and the police presence, they used their weapons to attempt to seize a car that had stopped at the crash, before being restrained by police, three of whom were awarded the Queen’s Gallantry Medal.
- http://bygone.dundeecity.gov.uk/bygone-news/january-1983 Bygone News January 1983
- http://www.thefreelibrary.com/FATHER+FROM+HELL%3B+He+murdered+three+-+just+to+beat+his+son.-a061048128 FATHER FROM HELL; He murdered three - just to beat his son.
- "Anger at double killer's day out". BBC Online. BBC News. 12 July 2007. Retrieved 17 August 2010.
- Tribute To Teacher Killed By Monster Mone, Daily Record (2 November 2007)
- Carstairs State Mental Hospital Incident - Hansard, 1 December 1976
- http://www.london-gazette.co.uk/issues/47625/supplements/10123 Supplement to the London Gazette of Thursday, 24 August 1978