The trial started immediately after attorneys selected the final two alternates.
Mangum is charged with stabbing her boyfriend, Reginald Daye, with a kitchen knife during an argument in April 2011. Daye died 10 days later.
Jurors got a closer look at the relationship between Mangum and the man she's charged with murdering, Reginald Daye when Daye's relatives took the stand.
Wiping away tears, Daye's nephew, Carlos Wilson, said Daye was the kind of man that women took advantage of.
He wasn't the only one to get emotional in court. Mangum openly wept while the jury listened to the 911 calls that came in after she stabbed her former boyfriend.
Daye's nephew called for help after Daye showed up at his door, wounded and bleeding.
Mangum's young son also called 911 and then Mangum herself called for help. She told the operator a man beat her up.
Mangum is claiming self defense. She says Daye died from a medical mistake at the hospital and not from his stab wound. However, Daye's relatives suggest otherwise.
"Reggie was more of a lover than a fighter, said Wilson."The relationships that he was in prior were more where he was abused. They were the abusers. We used to joke with him a lot about women beating him up."
"He kicks the door down, rips it off its frame, goes into the bathroom, grabs Ms. Mangum by the hair, drags her into the bedroom, and then at that point, somewhere within a little bit of time of that, he gets stabbed, " said defense attorney Daniel Meier. "
Officers at the scene also testified Thursday. They said Mangum seemed impaired when they took her into custody.
Mangum made national headlines in 2006 when she accused a group of Duke University lacrosse players of sexually assaulting her while she worked as a stripper at a party. The accusations were later found to be false, and Attorney General Roy Cooper dismissed all charges filed against the students.
Mangum has gone through several attorneys - who asked to be removed from the case - and even represented herself for a time.
The revolving door of defenders pushed back her trial date for years. She is charged with first-degree murder, assault with a deadly weapon, and larceny.
Testimony resumes Friday morning.