Killer was wearing tag when he murdered drug dealer Tyler Donnelly

A teenager was running drugs for an ‘established operation’ when he was knifed to death in a park, a court heard. Tyler Donnelly, 19, was carrying a ‘large amount of cash and a quantity of drugs’ when he was repeatedly stabbed and left to die in Hanworth Park, near his home in Feltham, west London. Joshua Cowley, 28, Daniel Matos, 22, and Keith Preddie, 33, all deny murder. An unsmoked cigarette found in the park near Mr Donnelly’s body was…