The death of Sandra Bland left both the public and her family with unanswered questions they are still asking to this day. Three years after her passing, HBO documentary Say Her Name: The Death and Life of Sandra Bland is exploring the details surrounding her imprisonment and alleged suicide, with her loved ones questioning if Bland actually killed herself, as police claim, or if there was something more sinister at play.

“We were told: ‘Once you get here, it will be proven, without a doubt. You’ll be able to see that she contributed in her own death,’” Bland’s mother, Geneva Reed-Veal, explaines in the clip. After seeing the tapes in question, Bland’s family had even more questions.

“The video that we viewed when we went down [to Texas], it was only for the morning of Monday, July 13. There are no time stamps, there are no dates. Her cell was all the way at the back corner. She was in cell 95. The way they choose to phrase it is, ‘Where she was did not have cameras,’” Bland’s sister, Shavon, adds. “I think that’d be strange. Then how are you monitoring your inmates?”

“Why was she in a cell by herself? That’s a big cell for one person,” Bland’s other sibling, Sharon Cooper, expressed. “And when they were wheeling the gurney out, I went, ‘Whoa, she’s going to be on the gurney, right?’ Oh no… she was not on the gurney.”

Check out the clip below.

Say Her Name: The Death and Life of Sandra Bland, an HBO Documentary Films production, is set to world-premiere on Wednesday, April 25 as part of the 2018 Tribeca Film Festival.