A former Bowie State University student charged with murdering her roommate told jurors Thursday that she acted in self-defense.

Alexis Simpson, 20, testified that she was fighting with her roommate, Dominique Frazier, the night of Sept. 15, 2011, and got out a pocket knife to protect herself, according to media reports. At one point she swung the knife wildly, Simpson testified, cutting Frazier.

"I had to defend myself. I was scared," Simpson said, according to WJLA.

Prosecutors argued that Simpson aggressively pursued Frazier the night of the fight, which started after a disagreement over music being played on an iPod in their dorm room suite.

Frazier died after her neck was sliced open with a blow that severed her trachea and jugular vein, prosecutors said.

But defense attorneys countered that Frazier, too, kept a knife in her dorm, and roommates testified that Frazier went to get it that night before putting it away at the urging of a friend.

Jurors heard closing arguments in the case Thursday afternoon.