Updated

A central Kentucky teenager has been sentenced to 25 years in prison for killing her grandparents, who were found in their burned home.

Allison Deshae Wilson pleaded guilty but mentally ill to two counts of murder in April.

Her grandparents, 64-year-old Everett Garland and his 60-year-old wife, Linda Garland, were in their home near Eubank when the fire broke out in November 2013. Everett Garland died at the scene, and his wife died later at a hospital.

The couple had custody of Wilson, who was 16 at the time of the fire. Wilson, now 18, was sentenced in Lincoln County Circuit Court on Friday.

Investigators say the fire was intentionally set. Wilson also was originally charged with arson. But her guilty plea April 7 included only the murder charges.