PITTSBURGH — A woman on death row for starving her 7-year-old daughter will get a new sentencing hearing, the state’s highest court ruled, saying her trial attorney didn’t introduce enough evidence about her troubled childhood and diminished mental capacity.

The Pennsylvania Supreme Court ruled Wednesday that another Washington County jury must retry the penalty phase in the trial of 45-year-old Michelle Sue Tharp, of Burgettstown.

The court found “there is a reasonable probability that at least one juror” might have voted against the death penalty after Tharp was convicted of first-degree murder in the April 1998 death of her third child, Tausha Lee Lanham. The girl weighed less than 12 pounds.

Tausha was the third of Tharp’s four children and was premature when she was born in 1990, requiring hospitalization for the first year of her life. Trial evidence showed Tharp resented that, treating her other children well but refusing to regularly feed Tausha or seek medical care for her.