PICKENS, S.C. — A South Carolina woman admits she killed four members of her family but was mentally ill at the time she gunned down her two sons, her ex-husband and her stepmother.

Susan Hendricks pleaded guilty Friday to four counts of murder in the shooting deaths in October 2011.

Authorities say the 49-year-old Hendricks tried to make it look like one of her sons killed the others before he committed suicide. Investigators say Hendricks told deputies her son was suicidal.

The killings took place in two homes in Liberty. Authorities say Hendricks also killed a man in 2006, but claimed self-defense. Charges were never filed in that case.

Hendricks will be sentenced after a hearing later Friday.