‘I only meant to stab him in the arse’

A gambler stabbed a grandfather to death in the street minutes after buying an eight-inch carving knife in a hardware store, a court heard. Joseph Tripp, 35, paid £5 for the blade following a petty row with 54 year-old victim Derek McAllister at a betting shop in East Finchley, north London. He then squatted between two parked cars before lunging out to stab Mr McAllister in the back, it is claimed. Mr McAllister, who had celebrated his birthday the day…