Two women charged with killing Kim Jong-nam, the half-brother of North Korea's leader, are revisiting the crime scene in Malaysia. <br/><br/>Indonesian Siti Aisyah and Vietnamese Doan Thi Huong are at Kuala Lumpur airport today. <br/><br/>The pair are accused of rubbing the highly toxic VX nerve agent on Mr Kim's face as he waited for a flight. <br/><br/>They have pleaded not guilty to murder, saying it was a TV prank and they were tricked by North Korean agents. <br/><br/>Pyongyang has denied any involvement in the 13 February killing, but four men – believed to be North Koreans who fled Malaysia on the day of the murder – have also been charged in the case.