A 21-year-old student at the University of Washington was fatally stabbed more than 100 times by her stepfather as she was trying to defend her mother from his abuse, authorities said.

In court documents obtained by HuffPost, police said that Angelina Tran, 21, apparently woke in the middle of the night on Aug. 7 to commotion coming from the familys kitchen in their home in Beacon Hill, Seattle. The documents allege that Tran saw her mother being beaten by her stepfather, Nghiep Kein Chau, 54, and stepped in to intervene at the cost of her own life.

Angelina Trans intervention allowed her mother to escape and hide in a nearby bedroom, but the defendant did not stop his attack, prosecutors said in a criminal complaint against Chau.

Chau has been charged with first-degree murder and first-degree attempted murder and is scheduled to be arraigned on Aug. 31.