BBC News - Isabelle Sanders murder: Partner's 'life-threatening' wounds 26 November 2014 Last updated at 19:35 An 86-year-old man who was attacked in his own home was stabbed three times and suffered two punctured lungs, a court has heard. Norman Busby was attacked by an intruder who burst into his home in the Crookston area of Glasgow just before 02:00 on 9 April. His partner Isabelle Sanders, 51, was stabbed to death in the attack. Paul McManus, 19, denies murdering Ms Sanders and attempting to murder Mr Busby. Dr Philip Munro, a consultant in emergency medicine, told advocate depute Bruce Erroch, prosecuting, that he arrived at the Southern General Hospital in Glasgow at 03:00. Dr Munro said that he checked x-rays and found that both Mr Busby's lungs had collapsed but a CT scan showed no signs of internal bleeding. Life-threatening He told the jury that by the time he arrived a colleague had administered morphine, for pain, another drug to slow internal bleeding, antibiotics and a tetanus jab. Dr Munro said he saw three wounds, to the front-centre of the chest. He said: "They appear to have been caused by something sharp like a knife." He added: "It is difficult to say how much force would be required. It would depend on the sharpness, but at least a moderate amount of force.  Speaking of Mr Busby's injuries Dr Munro said: "We believed them to be life-threatening." The jury heard that Mr Busby was in hospital for a month. 'I'm not a beast' Mr McManus has lodged a special defence of incrimination against Christopher O'Reilly and Ross Arthurs. Both men deny any involvement in the incident. Mr O'Reilly, 18 told the jury Mr McManus was "telling lies." He denied being anywhere near the house on 9 April when the attack took place. Tyre fitter Mr O'Reilly told the court: "I'm not a beast. Murdering an innocent old woman is a beast. I wasn't there when that old woman got murdered. Mr O'Reilly told the court that on the night of 8 April into the morning of April 9 he was staying with his girlfriend in Elderslie in Renfrewshire. Defence QC Gordon Jackson said: "The reason you are here is because you went to that house where the woman died that night." Mr O'Reilly responded: "I wasn't there."