Oklahoma prison officials say a 25-year-old woman convicted of second-degree murder for pushing her husband to his death from the 25th floor of their apartment has died in prison.

Oklahoma Department of Corrections spokeswoman Terri Watkins says Amber Hilberling was pronounced dead at 5:33 p.m. Monday at the Mabel Bassett Correctional Center, where Hilberling had been serving a 25-year prison sentence for the 2011 death of her husband, Joshua Hilberling -an Air Force veteran.

Hilberling fell from the 25th floor of the University Club tower and landed on a parking garage below. (Facebook)

Hilberling fell from the 25th floor of the University Club tower and landed on a parking garage below. (Facebook)

The Department of Corrections says she died by hanging herself in her cell.

During Amber Hilberling’s trial in 2013, Joshua Hilberling’s family testified that on the eve of his murder, Joshua had packed his bags and was planning to leave his wife after enduring abuse at her hands.

Watkins says the state medical examiner’s office will determine Amber Hilberling’s cause of death.

Hilberling, who was 19 at the time and seven months pregnant, argued that the death was an accident caused by “unusually thin” windows in the couple’s apartment.

The Associated Press contributed to this report

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