Updated at 3:20 p.m. ET
A former nursing assistant at a medical center for veterans in West Virginia has pleaded guilty to seven counts of second-degree murder and one count of assault with the intent to commit murder.
Reta Mays, who worked at the Louis A. Johnson Veterans Affairs Medical Center in Clarksburg, appeared in federal court Tuesday and admitted to killing the patients by injecting them with insulin. She also admitted injecting an eighth patient in order to kill him.