Sandra Bland's mother says she wants the former Texas trooper who pulled her daughter over last summer to be held accountable for his actions.

Geneva Reed-Veal said Tuesday she's also still seeking answers as to how her daughter could have killed herself in a jail cell in Waller County, northwest of Houston.

She spoke following an arraignment for Brian Encinia, who pleaded not guilty to a misdemeanor perjury charge. He stopped Bland for a minor traffic infraction last July and arrested her after their confrontation escalated.

Bland, who was in the process of moving to Texas from the Chicago area, was found hanging in her cell days later. A medical examiner ruled it a suicide.

Protesters yelled "Tell the truth" and "Sandra still speaks" Tuesday outside the court building.