His attacker is described as mixed race, in his mid-20s, around 6ft - 6ft 2in tall, of muscular build with short, dark hair which was shaved at the sides.
Officers say he may have been with several people including an unknown woman, believed to be white, in her mid-20s with blonde, shoulder-length hair, around 5ft 7in tall and possibly wearing a pink t-shirt.Police say they are "determined to catch the person responsible" for Robert's death, and are taking "a fresh look at the evidence".
Making an appeal on BBC Crimewatch, Detective Inspector Madeline Kelly said: "We are appealing for people to dig deep into their consciences - it you were one of the people involved on the day we would urge you to come forward."Allegiances and friendships will have changed so if anyone has any information they can report it to police in confidence, particularly if they feel they could not before.
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