Sean Combs: Opening statements and the first witnesses.

Chloe Melas describes the mood inside and outside the Manhattan courthouse on the first day of testimony. The record producer has denied the allegations against him, and in his defense's opening statement claimed the encounters described in the indictment were consensual. A security guard tells the jury what he saw after Combs was caught on tape beating Cassie Ventura in a hotel hallway. Then a man who says he took part in freak offs testifies that he too witnessed alleged violence by Combs toward Cassie. For more NBC coverage of the trial check out our newsletter, “Diddy On Trial”: NBCNews.com/Diddy Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.