Sean Combs: Singer Dawn Richard and Cassie's ex-best friend testify.

The former Danity Kane member endured a tough cross-examination but maintained that she witnessed Combs be violent toward his ex-girlfriend on more than one occasion. And Kerry Morgan, who says she and Cassie became best friends when they were both teenage models, says she too witnessed Combs asault Cassie. But when Combs assaulted Kerry, she says, she signed an NDA and broke ties with both of them. If you want to read NBC's 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.