By Judd Legum

On June 10, the murder trial of George Zimmerman will begin, 470 days after he shot and killed Trayvon Martin on a rainy evening in Sanford, Florida.

Since that night, Martin’s death has already had a profound impact on Sanford and the nation. But outcome of the trial, which is expected to last between four to eight weeks, is still uncertain. Since Zimmerman does not dispute that he killed Martin, the defense must establish that Zimmerman acted in self defense.

Here is the key evidence that could support a murder conviction.

1. Expert audio analysis. An audio expert says Trayvon Martin screamed “stop” and “I’m begging you” just before shot was fired. Alan Reich, an audio expert retained by the prosecution, says his analysis of 911 calls that night revealed that it was Martin, not Zimmerman, who was crying out for help prior to the shooting. Another expert, Thomas Owens, said he ruled out Zimmerman as the source of the screams. The defense has retained an expert from the United Kingdom who says the kind of analysis performed by the prosecution experts is not reliable.

If Reich’s testimony is admitted at trial and the jury finds it to be reliable, it would seem to undermine Zimmerman’s claim of self-defense. Its unclear if the testimony will ever reach the jury, however. The judge held a hearing on the admissibility of Reich’s analysis over three days but was unable to conclude it prior to the start of jury selection. The prosecution must show Reich’s “conclusions are based on methods ‘commonly accepted within their particular scientific or expert community‘ as reliable.” It will be completed next week.

Read More How George Zimmerman Could Be Convicted Of Murder | ThinkProgress.