Sandra Bland's Family Orders Independent Autopsy After Alleged Jail Suicide

Sandra Bland's sister, Sharon Cooper, opened up to ABC News.

— -- The family of Sandra Bland, who died in police custody Monday in Texas, has ordered an independent autopsy to be conducted today, a family attorney told ABC News.

The family expects autopsy results with 48 to 72 hours, family attorney Cannon Lambert said.

"We want to understand how it is that this kind of played out and what will end up ultimately being the cause of death," Lambert said.

While authorities said that Bland, 28, committed suicide, her relatives say she was days away from starting a new job and would never take her own life.

Bland was found dead in her cell three days later.

Waller County District Attorney Elton Mathis said an autopsy found Bland died by asphyxiation and that she used a plastic bag to hang herself from a partition in her cell. He added that although jail video didn't show what went on in Bland's cell, it showed no one went in or out of it from the time she was placed there until a jailer found her unconscious.

"I want you guys to know it's a daily struggle. It's a daily test," she said. "Depression is nothing but the devil. It's a way of mind and it's a way of thinking."

The Associated Press contributed to this report.