Dr. Conrad Murray's mother says she's "suffering" from overwhelming sadness because her only son is incarcerated -- and has begged the judge to go easy on the Doc when it comes to his sentence.
Mrs. Milta Rush sent a letter to Judge Pastor -- explaining why Murray deserves mercy ... because he's a good person who has "never drank alcohol, took drugs or smoked cigarettes in his life."
Milta explains, "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."
Milta continues, "I sympathize with Mrs. Jackson as a mother; 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 the courts rules. I am sorry for her loss."
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