Teen 'stabbed through heart' at Boxing Day sales, court hears It involved "bad blood" between Mr Diarrassouba and his association and accused knifeman Jermain Joseph and his friends. He added: "The grievance was evidently a deep and powerful one. It led almost instantly to ugly, brutish violence in broad daylight in a packed street on the busiest shopping day of the year. You may think that was one of the days and places people could go in peace. Jermaine Joseph, 23, from Tottenham, and Thulani Khumalo, 20, from Finsbury Park, both north London, deny murder on December 26, last year. Joseph told police he acted in self-defence and Khumalo denied involvement in the stabbing.