Joseph Houston was yesterday found guilty of murdering 20-year-old James Dorloff at a New Years party at Wedge Island in 2013. The footage starts just moments after Houston struck Mr Dorloff across the neck with a machete. His jugular vein was severed and he died at the scene.Houston also slashed another man, Tyson Cummings, across the hand, and Mr Cummings can be seen stumbling across the sand before Houston (wearing a red jumper) comes into the picture, holding the machete in his right hand.The footage was a key piece of evidence at Houston's trial which ended on Thursday with a jury finding him guilty of murdering Mr Dorloff and of causing grievous bodily harm to Mr Cummings. Houston has been remanded in custody until he is sentenced in August.