Killer knifed man to death after row in a bookies

  A killer bought a £5 carving knife and stabbed a grandfather to death in the street minutes after a petty row in a betting shop, a court heard. Joseph Tripp, 33, allegedly flew into a rage following the argument with 54 year-old Derek McAllister and picked out the biggest blade he could find at a nearby hardware store. He then hid behind parked cars just feet away from the oblivious Mr McAllister before leaping out to stab him in…