Michael Jackson's attorney, Tom Mesereau, disgusted by Murray's voicemail

Thomas Mesereau -- the lawyer who successfully defended Michael Jackson in the 2005 molestation trial -- literally could not stand to listen to Conrad Murray's desperate voicemail yesterday ... telling TMZ, "This man is despicable."

Tom was out in L.A. when we played the recording for him, and after just a minute, Tom turned it off with a disgusted look on his face ... saying, "I can't listen to any more of this."

Tom then tore into Conrad Murray over his desperate pleas for sympathy -- saying, "This man is despicable. This man has never taken responsibility for what he did to Michael Jackson. He's always been a blamer. He blames Michael Jackson for everything."

Tom added, "[Conrad] wants everyone to feel sorry for his situation. He caused the death of one of the greatest artists in world history ... a kind, decent, wonderful, nice person. He caused his death and he's never taken responsibility for it."

TMZ posted the voicemail recording yesterday morning, in which Murray pleads with a friend to save him from jail -- saying, "I can't sleep now ... it's very hard ... I'm in constant pain ... can someone please help me please!?"

Apparently, Conrad Murray‘s baby mama Nicole Alvarez, sold a sobbing voicemail message that he made from jail as he sobbed about not being able to sleep, to a tabloid website so she could pay her rent, RadarOnline.com reported.

“Nicole sold the voicemail message Conrad left for her to a tabloid gossip website for several thousand dollars so she could pay her rent. Nicole relied on Conrad to support her and their young child. She hasn’t been able to find steady work as an actress since she testified at Conrad’s involuntary manslaughter trial,” a source told RadarOnline.com.

Judge Michael Pastor sentenced Murray to four years in state prison, but because of jail overcrowding, Murray is serving his sentence at a county jail in Los Angeles, and he is expected to be released at the end of 2013. During the voicemail message, Murray cries, “I can’t sleep now, it’s very hard, I’m in constant pain. Can someone please help me? I can’t use my hands anymore, I have no more use of my arms.”

Meanwhile, Murray is “ever so hopeful that his appeal will be successful, and he will be let out of jail early on bail while his appeal is heard,”  the insider said. Murray has been passing time in jail by writing a tell-all book in hopes that he will get a big payout from a publisher. There has been zero interest in the book after reps for Murray reached out to several publishers.

However, the chances of Murray being let out early “ are really slim to none. Murray has been deemed a flight risk, and he has been denied several times before during the appellate process to be released,” a law enforcement source told RadarOnline.com.