A former Bowie State University student accused of murdering her roommate last year was acquitted Thursday night of all charges against her after defense attorneys argued she acted out of self-defense when she was attacked in her dorm.

Jurors found Alexis Simpson, 20, not guilty of murder and other charges stemming from a September 2011 confrontation with her roommate, Dominique Frazier, that left Frazier dead from a fatal cut to the neck.

Prince George's County State's Attorney Angela Alsobrooks said she was stunned and disappointed by the verdict. Prosecutors had argued Simpson instigated the fighting the night Frazier was killed.

Prosecutors and defense attorneys both agreed that the roommates never got along, and Simpson's attorneys presenting jurors with a pattern of bullying behavior that culminated in the fatal disagreement between the two women.

The fight the night of Sept. 15, 2011, began when a disagreement about music being played on an iPod escalated to the point where Simpson and Frazier ferociously traded blows.

Simpson went to her room to get a knife, and when the fighting resumed, one blow sliced open Frazier's neck.

The bullying became too much for Simpson, who earlier in the school year tried to be transferred to a different room but was denied by a property management company, according to attorney Christopher Griffiths.

"I had to defend myself. I was scared," Simpson testified when she took the witness stand on Thursday, according to WJLA.