A dad and his girlfriend have been found guilty of the killing of six-year-old Arthur Labinjo-Hughes.   Emma Tustin was found guilty of murder following Arthur’s death from unsurvivable brain injuries after he was found with 125 areas of bruising on his body.     She was accused of taking a photograph of the boy on her mobile phone as he lay dying in the hallway following a brutal assault.     Her partner Thomas Hughes, 29, was convicted of …