|Conrad Murray insists he is 'innocent'
of Michael Jackson's death
The shamed doctor is currently serving four years in jail on an involuntary manslaughter charge relating to the King of Pop's death in June 2009, but he maintains that he was not responsible for his passing.
Murray - who was found guilty of administering the fatal dose of anaesthetic Propofol which killed Michael - insists he has been made a scapegoat for tragedy and is himself still grieving for the loss of his friend.
In a telephone interview from prison on current affairs show 'Anderson Cooper 360', Murray - who was stripped of his medical license - said: "I'm an innocent man, Anderson. I maintain that innocence. I'm extremely sorry that Michael has passed. It's a tremendous loss for me, it's a burden I've been carrying for the longest while and it's a burden I will carry for an indefinite period of time.
"The loss is just overwhelming. He was very close to me, I was close to him, we were absolutely great friends."
Murray also went on to explain his reason for refusing to testify in the wrongful death lawsuit trial Michael's mother Katherine has brought against concert promoters AEG Live - which accuses the company of being responsible for negligently hiring Conrad to care for Michael as he prepared for his 50-date 'This Is It' concert residency at The O2 in London.
He said: "If I testify, I will testify very honestly. It is a sad thing when I look at what's going on on the television because if Michael was alive today he would be absolutely upset, he would be so unhappy with what is happening."
During the interview, Murray - who could be released in October - bizarrely broke into a rendition of Nat King Cole song 'The Little Boy That Santa Claus Forgot'.
The disgraced physician claimed the track - which is about a little boy who gets no Christmas gifts - was the story of his own life.
After singing several lines from the song, Murray explained: "That song tells my story. That's how I grew up - I had no Christmases, I had no toys. I had nothing."
The trial for Katherine's lawsuit against AEG Live began in Los Angeles on Tuesday .