Six weeks have passed in the Dr. Conrad Murray manslaughter trial, and now it's up to the jury to decide whether the doctor is guilty or not ... of killing Michael Jackson.

The twelve men and women of the jury have begun deliberations. Their decision can come as soon as today or could take weeks to decide.

During closing arguments on Thursday, defense attorney Ed Chernoff said the prosecution "absolutely failed to prove a crime."

In comparison, prosecuting attorney David Walgren referred to the defense's theory as "junk science."

Dr. Murray is accused of injecting the King of Pop with a lethal dose of Propofol on June 25, 2009, resulting in Jackson's death.

In our X17 Poll asking readers if Dr. Murray should be found guilty, 53% of you said "yes" while 46% believe he's innocent.

The prosecution and defense gave closing arguments in Conrad Murray's involuntary manslaughter trial on Thursday.

Defense attorney Ed Chernoff said the prosecution "absolutely failed to prove a crime."

All the defense has to do is give the jury reasonable doubt for Murray to escape conviction. Chernoff reminded the jury of the defense's argument; that Jackson swallowed Lorazepam on his own.

Prosecuting attorney David Walgren called the defense's theory "junk science." He reiterated his points that Murray did not call 911 soon enough, and that he was negligent in his everyday care of Jackson. "Conrad Murray knew what he had done, and he knew his acts killed Michael Jackson ... Justice demands a guilty verdict," he said.

Paris Hilton's parents, Rick and Kathy, turned up at the LA Superior Courthouse today to support their friends, the Jackson family, at the manslaughter trial of Dr. Conrad Murray.

Kathy went to high school with Michael and the families have been friends ever since.

Today is set to be the last day of testimony, so Kathy wanted to lend her emotional support. Janet Jackson made an appearance today as well, glammed up in an off-white pantsuit with black accents.

Conrad Murray's involuntary manslaughter trial continued Tuesday as the defense called its witnesses -- and the day went fast.

By early afternoon, the defense had already called five of its expected 15 witnesses to the stand.

The most eventful witness of the day was No. 6, nurse practitioner Cheryl Lee -- who treated MJ. She got emotional when talking about Michael Jackson and needed a moment to compose herself. Lee testified that she refused numerous requests from Jackson to give him Propofol, which might support the defense's theory that Jackson self-administered his fatal dosage.

The defense cross-examined the prosecution's final witness in Conrad Murray's involuntary manslaughter trial today (day 14), in what was perhaps one of the most dramatic days of the trial.

Dr. Steven Shafer -- a longtime expert on Propofol -- took the stand again. A recap:

• Shafer said that it would have taken a lot of "time and coordination" for MJ to inject Propofol into himself (the defense is arguing that MJ injected Propofol into himself when Dr. Murray left the room to use the bathroom, thus causing an overdose.)
• It came out that MJ's veins had become so unavailable from injections that Murray had started to give him IVS below his knee.
• Shafer dispute the defense's contention that MJ ingested eight tablets of Lorazepam, another sedative, on the day he died. Shafer said the actual amount was much smaller.
• Shafer said MJ had been given more than the 25 milligrams of Propofol that Murray told police he'd given the singer.
• Judge Michael Pastor called a break after Murray lost his cool; Murray got upset when Shafer started using an infusion stand to demonstrate how MJ would have been given Propofol. "Can you believe that?" he said to Dr. Paul White (a defense witness.) "What a scumbag," White told the media sitting near him.

White told E! that though Shafer is a former student, friend and colleague of his, Shafer's testimony has changed the way White thinks of him. "The truth will come out," he said. "It always does. I am going to take the high road ... "

White also called Deputy District Attorney David Walgren's use of evidence as "unethical and unconscionable."

Could this mean the tables might turn for the defense? The defense has its chance to call witnesses now.

After a two-day break, Conrad Murray's involuntary manslaughter trial resumed Wednesday.

The prosecution called its final witness to the stand again: Dr. Steven Shafer (above, right), who was hired 20 years ago by the company that produces Propofol -- the drug that killed Michael Jackson -- to calibrate the correct dosage for the drugs. A recap:

• He said keeping records of patient care is critical. Murray did not. Shafer called this "unbelievable."
• He said the 15.5 liters of Propofol Murray bought for MJ's tour -- about four gallons worth -- was "an extraordinary amount" to use on one person.
• Shafer said Murray's lack of basic monitoring devices was a violation of care.
• Shafer described Murray's treatment of MJ as an "egregious" and "unconscionable" violation of care.
• Shafer said dosage of Propofol is crucial, and that it should only be done through a pump to avoid overdosing (Murray did not.)
• He said Murray "left the steering wheel" when he went to bathroom to relieve his bladder, leaving MJ alone and under the sedation of Propofol.

The defense will now have its chance to call its own witnesses to the stand.

After two cancelled court dates this week, the Conrad Murray murder trial has resumed.

Dr. Steven Shafer, who is an anesthesiologist and Propofol expert, is the prosecution's final witness. Last Friday, Shafer was the last witness to take the stand and is expected to wrap up his testimony today.

During his testimony, Shafer has explained how he's been working with Propofol for over 20 years.

He also revealed that he was hired by the company that produced the drug two decades ago ... to figure out the correct dosage.

Prosecutors are hoping Shafer will help to prove Dr. Murray was negligent when administering the drug to Michael Jackson.

Dr. Conrad Murray's involuntary manslaughter trial took a shocking turn on Wednesday morning as the defense announced it was abandoning one of its main points -- that Michael Jackson had accidentally killed himself by swallowing Propofol.

Testimony from two of the prosecution's witnesses, Dr. Alon Steinberg, a cardiologist, and Dr. Christopher Rogers, the doctor who declared Jackson's death a homicide, put big holes in that theory.

The defense could still argue that Jackson injected the drug, but Rogers testified that he thinks that is unlikely. Find out why below.

• The defense has argued that Murray was not negligent because he only left MJ alone for "two minutes to use the bathroom" after administering Propofol.
• Rogers pointed out that, if that is true, that would not have been enough time for MJ to self-administer Propofol, which the defense has argued is what killed Jackson.
• He also pointed out that Jackson would have had to wake up from his Propofol-induced sleep (Conrad said Jackson was sleeping when he left the room), and then given himself the drug.
• Jackson's death was the result of an overdose of Propofol. Rogers said what is more likely is that Murray gave Jackson several doses of Propofol over a few hours without monitoring the doses.

In addition, the prosecution is gaining ground on their argument that Murray was grossly negligent -- see what Dr. Steinberg testified after the jump.