My son, 17, was stabbed on dancefloor then died after open heart op at roadside…what I saw in court was more traumatic

GRIEF-STRICKEN Martin Cosser could barely compose himself as the traumatic footage was shown to a stunned-silent courtroom. The horrific mobile phone video was being shown - again - depicting his son Charlie, 17, staggering from a music festival marquee having just suffered a horrific stab wound. He would go on to collapse and later die....