Police investigating the fatal stabbing of a man in Cambridge have made another arrest.
Peter Anderson, 46, was attacked on Stourbridge Common in broad daylight on July 25.
Officers now believe Mr Anderson, who was also known was 'Blue', may have been in the area to buy drugs.
A 20-year-old man from London has become the latest person to be arrested on suspicion of his murder, as well as possessing a knife and supplying class A drugs.
Police have made a direct appeal to the Cambridge 'drugs community' to get in touch.
"I believe there are still a lot of people with information who might be shying away from speaking to police but I would urge them to come forward," Detective Inspector Alan Page said.
"This is a murder. Blue was a well-loved character in the community and we need to get justice for him and his loved ones.
“If you have information about what happened on that afternoon on Stourbridge Common please come forwards."
Another man, 18-year-old Juned Ahmed from London, has been charged with murder and drugs offences.