Missing couple killed in double murder, police believe Chantal Barnett and Robert Martinez. Police believe a young Queensland couple who disappeared seven months ago has been murdered. Robert Martinez, 26, and Chantal Barnett, 27, were last seen in the Rockhampton and Yeppoon area in central Queensland in late February or early March. Local detectives have now called in the state's homicide squad. Detective Senior Sergeant Scott Moon said police were desperate for more information. ""We again reiterate that regardless of how trivial you think the information you have might be, please come forward and let us know,"" he said. "As we take this investigation through to a new phase, we will continue to work closely with the Homicide Investigation Group."" In March Mr Martinez's mother, Julie, said she feared the worst for her missing son. "I can feel he's not with us anymore," she said. Robert is the peacemaker of the family and keeps everyone together ... we have been torn apart. In April, police found Mr Martinez's wallet in the Gavial Creek area on Bowlin Road. After receiving a tip-off from a member of the public in May, police and State Emergency Service volunteers searched bushland around Mount Archer, near Rockhampton. They found a piece of jewellery while scouring deep gorges in the area, but could not determine at the time whether it was connected to the case.