thanks, pete. opening statements in the second degree murder trial of george zimmerman begin at 9:00 a.m. tomorrow. this after a crucial decision by the judge about screams heard on a 911 call the night trayvon martin was killed. joining me now, nbc's ron mott who has been following the case. what's the latest? >> reporter: this ruling was crucial. the judge clearly took the time in making this order. she is not going to allow them to bring audio experts into this case. now the 911 call itself can be played and ultimately the jury will decide for itself who it thinks is screaming for help. >> reporter: today as lawyers wrap up preparations for mon's opening statements in a second degree murder trial that could send george zimmerman to prison for the rest of his life. >> he's exhausted. he's stressed. >> zimmerman's lead attorney says his client is tired but more than ready to clear his name. >> even when he gets vindicated he's not going to have the life he wants back.