A teenage mother has been sentenced to 15 years to life in prison after being found guilty of snapping the spine of her 2-year-old son.

Adrianna Lucero was sentenced in 3rd District Court on Friday. She was found guilty of first-degree murder and second-degree felony child abuse or neglect during a trial in April.

Utah Medical Examiner Todd Grey testified that the boy's spine had been snapped. Lucero was 17 when the boy died Aug. 24, 2008.

Before she was sentenced, Lucero told the court that she didn't kill the boy and that she's wrongly being held responsible.

Lucero also was sentenced to up to 15 years in prison on the child abuse count, but the judge set that term to run concurrently with the other sentence.