She has been classed as a 'vulnerable inmate.'

Murderer Emma Tustin has been put into prison isolation after becoming a "massive target". The 32-year-old was found guilty of murdering 6-year-old Arthur Labinjo-Hughes earlier this month. Tustin is expected to serve a minimum of 29 years in prison. She is serving her sentence at Peterborough jail but has now been declared a vulnerable inmate. The killer has no contact with other prisoners. She eats, washes, and exercises with only prison guards around her. A source told The Sun, "Every effort is being made to protect her from attack. Like it or not, prison officers have a duty to keep order and the rule of law inside." "In her case, they’re gritting their teeth to do it but she’s a massive target. It’s only a matter of time before someone takes a chance to do her in," they revealed. Arthur died from a severe brain injury at the age of 6. His father Thomas Hughes was found guilty of manslaughter. He was sentenced to 21 years in prison. During their trial, the court was told that Arthur was subjected to the medical definition of child torture. Many believe that Tustin's sentence was not severe enough for what she did to her stepson. Arthur's grandmother said last week that "life should mean life." Madeleine Halcrow said he was "the happiest child" but that he "lost the sparkle in his eyes" prior to his death. "He was my daughter’s baby bear and my sunny delight. He was gentle, caring, compassionate. But he had lost the sparkle in his eyes, if that makes sense," she said. "His dad came to pick him up and he said to his dad 'Is she in the car?' and he said yes and Arthur started to cry, which isn’t like Arthur. "There was no remorse, no sympathy shown. [They are] absolutely depraved, sadistic, torturous, evil calculated people… they will burn in hell."