Dr. Conrad Murray's mother has written to the judge begging for "leniency" in her son's case.

Michael Jackson's personal physician is due to face a US court today to be sentenced for the involuntary manslaughter of the musical icon.

Conrad faces up to four years in jail after he was found guilty of giving Michal a fatal overdose of the anaesthetic Propofol by a jury on November 7.

Prosecutors will be pushing for the full four years, whereas the defence team will argue he should be granted probation because he is already facing a life of shame, diminished opportunities and possibly the loss of his license to practise medicine.

Conrad's 80-year-old mother Milta Rush has sent a letter to Judge Pastor asking him to consider all the factors surrounding her son before sentencing the 58-year-old.

"This is the first time [Murray] is facing such an ordeal," she wrote according to E! "Nothing like this has ever happened to him before. He has never been in trouble with the law before and I am barely standing, scared and worried sick about him being incarcerated. He is saddened and remorseful about the death of his friend Michael Jackson and I do believe he is certainly learning the toughest lesson of his life. I also believe his compassion and his soft heartedness for others led to this dilemma and what a debt to pay."

Milta also expressed sympathy for Michael and his family.

In particular she expressed her sorrow for the singer's mom, Katherine Jackson.

"I feel her pain for having lost her son. I sense she was very close to her son. I really wanted to approach her personally and tell her I am sorry for the loss of her son but I was unsure if she would be receptive, and I did not want to take the chance of violating court rules," she explained.

"I humbly beg for your heartfelt consideration of everything I have said about Conrad, and ask for your compassion and leniency in giving him probation or community service."