An alleged serial rapist and murderer on Thursday claimed that the scratch marks on his face were caused by a rock that injured him while working at a mine.Thapelo Motseki denied the testimony by a medical doctor‚ who told the High Court in Johannesburg sitting in Palm Ridge that scratch marks on his face were consistent with human nails.Alleged serial killer and rapist disappeared from work when colleague was killedDr Isaac Siko‚ who is a pathologist working in Rustenburg‚ North West‚ said the wounds were consistent with nail scratch marks because the injuries were shallow and smooth.Alleged serial rapist and murderer used same modus operandi on victimsMotseki has pleaded not guilty to four counts of murder‚ four of rape and three of kidnapping.His alleged victims included his colleague Cinthiah Anikie Setuke‚ 36‚ Emerencia Botshelo Kgakatsi‚ 17‚ Lungile Kubheka‚ 15‚ and Thembelihle Dlamini‚ 16.It is alleged that on the night of October 8 2013‚ Motseki raped and killed Setuke while they were working underground at Aquarius Platinum Mine.Setuke's half-naked body was later found by her colleagues.Kgakatsi was last seen alive on April 30 2013 in Seraleng‚ near Rustenburg‚ on her way to visit her boyfriend Koketso Mosime in Kanana nearby.Her body was found the following day in Seraleng after she was last seen in the company of Motseki the previous night.Kubheka’s body was found on August 6 2013 in a yard opposite her parental home in Snake Park‚ Soweto‚ while Dlamini's body was found on May 25 2014‚ in a yard a few houses away from her home.The trial continues.-TMG Digital/Sowetan..