Conrad Murray wants his medical licence back. The disgraced physician - who was jailed for the involuntary manslaughter of Michael Jackson after administering a fatal dose of Propofol in 2009 - wants to return to work. He told Mirror.co.uk: "I am an innocent man. "I was unjustly punished for a crime that never happened. I see no reason why I shouldn't be able to work in the US. I surrendered my licence voluntarily and am confident it will be re-instated." Dr Murray, who has just written a book about Michael called 'This Is It', claims he needs to return to work as he is forced to survive on the charity of friends but he has been helping patients on a voluntary basis. The 63-year-old medic - who was jailed for four years, in 2011 - said: "Since being freed, I have continued to help my patients and many new patients who have come to me because of my reputation. "They come from across the world; from Spain, Israel, America and the South Pacific. Do I charge them? No. I do not charge for my services. I volunteer to help them and see them through their problems. "Most are major heart surgery patients. I help them and I help give them peace of mind. How do I benefit? The one thing that has always driven me is the fulfillment of making a difference. "I am highly skilled and have an unblemished medical record. My career has been impeccable."