A man has been charged with murder after an alleged argument between campers turned deadly in northern New South Wales.The 26-year-old man was believed to be with a 33-year-old man and 25-year-old woman at a campground in Ebor on Sunday, when the two men are believed to have gotten into an argument.As the argument escalated, the younger man allegedly struck the 33-year-old on the head with an axe at around 10.30pm, causing critical head injuries.LIVE UPDATES: Trump says the 'big