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."

"Judge Pastor, Conrad, is my son and as a mother I must say I know him inside out. He is sorry for what happened to Michael and had no intent towards him."

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