A former nurse at a Veterans Affairs hospital in Kentucky has pleaded guilty to involuntary manslaughter in the death of a World War II veteran.

Maria Kelly Whitt entered the plea Monday morning in U.S. District Court in Lexington. The plea ends a case that started with 90-year-old Jesse Chain's death from acute morphine intoxication on Sept. 3, 2006, in the hospital's intensive care unit.

Whitt, who has been free on bond, is set to be sentenced on April 1 in Lexington. She was originally charged with murder. Her trial was to start Jan. 18.

Chain served with the 445th Bombardment Group of the Army Air Corps.