A boy of 13 has become one of the UK's youngest murderers after he was jailed for killing a woman he had just mugged by stamping on her face so hard it left a footprint on her cheek. Shocking CCTV footage shows the horrendous moment Petri Kurti murdered 47-year-old Glynis Bensley before he fled to a nearby park in Smethwick, West Midlands and boasted about the savage attack. The schoolboy, who can be named after a judge lifted a reporting restriction order, was jailed for a minimum of 12 years today and will be on licence for life. His co-defendant, Zoheb Majid, was sentenced to 10 years behind bars for manslaughter and robbery. Scroll down for video . CCTV of the attack was shown in court, with 13-year-old Kurti seen jumping Ms Bensley as she walked home. Co-defendant Majid then joined in, with the pair leaving her for dead in a pool of her own blood . Killed: Glynis Bensley was murdered by Petri Kurti, 13, as she walked home in Smethwick, West Midlands . Sentencing Judge John Warner said the boy had been 'running wild' in his home life. 'You come from a home where there has been a complete lack of boundaries or structure where neither parents understand the seriousness of your behaviour - they blame others. 'This reinforces your own clear reluctance to take responsibility for your own actions.' Previously the court heard how the pair had teamed up with the sole intention of carrying out a violent robbery. CCTV footage captured Kurti jumping Ms Bensley in the street as she made her way home from Seven Stars pub. Majid joined in seconds later before the pair flipped her body over to ransack her pockets. Kurti was then filmed stamping on her face, leaving a shoe print on her skin. The court previously heard that both Majid and the teenager thought Ms Bensley was a man because of her clothes and haircut. He pleaded guilty to manslaughter but was found guilty of murder following a trial last month. Kurti had been excluded from school and a pupil referral unit for his aggressive behaviour, and as young as he was, already had previous convictions for attempted theft, assault with intent to steal and battery. He sentenced the 13-year-old to 12 years imprisonment for the murder with five years concurrent for robbery. Also jailed: Zoheb Majid, 20, was sentenced to 10 years imprisonment for manslaughter and robbery . He was given another 12 months, to run concurrently, for another street robbery carried out with his 25-year-old sister whilst on bail for the murder on February 4. The teenager was ordered to be detained at Her Majesty's Pleasure - the equivalent of a minimum term life sentence for a youth. Judge Warner added while Kurti had boasted of the attack afterwards, he demonstrated 'criminal maturity'. 'I'm in no doubt that she was targeted by you both, selected to be robbed' he continued. 'She was chosen by you because she was clearly in a vulnerable condition. 'It started with you Petri Kurti punching her and she went to the ground. 'She suffered a minimum of two blows. There was a clear print of a shod foot visible on her cheek, she had been stamped in the face. 'You Petri Kurti were just 13 when you committed this murder, on the streets late at night effectively running wild. 'This was a murder committed for gain, a night time robbery. The victim was vulnerable and targeted as such. 'Zoheb Majid, you're about to turn 21. 'You knew what you were doing and knew what you were involved in. You knew the victim of this night time robbery was a vulnerable person.' Earlier the court was told Kurti 'was not a mature' 13-year-old. His solicitor, Michael Turner QC, said: 'He's operating at a level of a seven to 11-year-old in terms of his cognitive ability. 'He has real learning difficulties. He accepted the act that caused the death and limited the decision of the jury to one of intent. Distraught family: Ms Bensley's siblings, Dawn and Harry Bensley, were at Wolverhampton Crown Court today to see their sister's killer jailed . 'He is susceptible to control and influence by those older than him.' After their sentencing Ms Bensley's family spoke of their horror that the 13-year-old had been out so late and behaving in such a violent way. 'It opens your eyes to a different world. We are talking two o'clock, four o'clock in the morning - that is not a normal 13-year-old,' said John Bensley, 60. 'They are cowards, the way they did it. She was an easy target.' 'Justice has been done. If it hadn't happened to Glynis it would have happened to someone else. It could have happened to anybody. 'They seemed a bit arrogant in court, there was no remorse. They are not sorry, they are sorry they have been caught." Paying tribute to the charity worker, Ms Bensley's sister, Dawn, said: 'She loved working for charities. She just liked to help people, she would help anybody." Detective Chief Inspector Samantha Ridding said the pair had intended to target someone in a violent robbery . Her brother Kevin, 53, added: 'Glynis had walked down that road for 30 years and never had a problem. 'She walked the same way for 30 years, they must have crossed paths before. Whether he was 13, 33, or 53, it doesn't make it any easier.' Leading the investigation Detective Chief Inspector Sam Ridding said: 'It was clearly the joint intention of the pair to use violence on anyone they targeted: they were in it together as the CCTV showed - they arrived within seconds of each other. 'Ms Bensley was tragically in the wrong place at the wrong time and was randomly picked out by the pair believing that she was a man and that she was wearing a gold bracelet. 'Our thoughts remain with Glynis’ family at this time and we hope that today’s sentencing will provide some help in their grieving process.'
Petri Kurti has been jailed for 12 years for the murder of Glynis Bensley . The teenager left a shoe-print on her face by stamping on it with such force . Ms Bensley, 47, died of a brain bleed following attack in West Midlands . Kurti's co-defendant was jailed for 10 years for manslaughter and robbery .