Fascinating case. If this was a novel, the same person who “framed” Campbell for the bird poisoning is now framing him for murder, but that stuff only happens in detective stories not real life.
Campbell seems like the most likely culprit, but the police clearly made an absolute mess of this and I don’t know how watertight their case is.
BBC News report that when the body was found he was cold and stiff to the touch (i.e obviously long dead) and covered in blood from 30 shotgun wounds to the face, amongst others, yet the police believed he’d had a medical incident and injured himself falling. When they realised their mistake they publicly stated he’d died about 8:30am and appealed for witnesses from that time despite rigor mortis having already set in and phone data indicating he’d died the night before. With mistakes like that, it’s hard to put much faith a police investigation, especially when they didn’t treat the (I assume) public footpath as a crime scene for 6 days.
From what I can tell so far the case against Campbell seems largely circumstantial. The pair clearly hated each other, Campbell has a habit of threatening to shoot people he doesn’t like (of which there are many) and there are potential questions over Campbell’s whereabouts on the day. But reading between the lines, it doesn’t sound as if they have found the murder weapon or have any evidence Campbell actually had or disposed of a shotgun. It’s also not clear yet how they can prove he fled the scene on an ebike. The most suggestive evidence is disabling his CCTV, but he discussed it with his daughter so he may have had a good reason and really bad timing. He clearly has motive, opportunity and possibility means, but he’d also be a convenient scapegoat for an embarrassed and potentially incompetent police force. IMHO.