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The estate of Amber Hilberling filed a lawsuit this summer alleging that the Oklahoma Department of Corrections did not do enough to prevent the woman’s death in prison.

The lawsuit was filed in Oklahoma County District Court by Rhonda Whitlock, a special administrator for Hilberling’s estate, on July 20. It accuses the DOC of exposing the inmate at the Mabel Bassett Correctional Center in McLoud to “individual and cumulative conditions of confinement that substantially increased the risk of harm to her.”

Hilberling, 25, was serving a 25-year sentence for pushing her husband, Joshua Hilberling, causing him to fall to his death through a window of their apartment on the 25th floor of the University Club Tower in Tulsa in 2011.

She reportedly was found hanging from a bunk bed in her cell by another inmate on Oct. 24, 2016. A medical examiner’s report says she died from asphyxia due to hanging and that she had methamphetamine in her blood at the time of her death.

Hilberling’s parents previously have said she was suicidal and accused the prison of mistreating their daughter, which at the time was denied by DOC officials.

The new lawsuit alleges that corrections officers never saw Hilberling’s body in a “suspended or hanging state.”