By Saffron Otter The chilling story of the ‘British Airways killer’ is back in the headlines as Robert Brown fights to be released from jail after just 13 years. The killer pilot used a hammer to callously beat his estranged wife, Joanna Simpson, 46, to death on Halloween night 2010 in their family home in Ascot, Berkshire. He hit Joanna 14 times as their two young children cowered in the playroom. His trial heard how after wrapping her bloody body in plastic sheeting, he bundled her body into the boot of his car and the kids into the back seat before dumping her body in a makeshift plastic co…