BETHANY, Oklahoma - An anonymous donor is offering a $50,000 reward for video of the torture and murder of a 19-year-old Mustang woman.

Carina Saunders dismembered body was found in a duffel bag in 2011.  And while the killers have never been brought to justice, investigators have spoken to several people who say they there is video of the murder. 

Seven years ago, investigators believe 19-year-old Carina Saunders was kidnapped, taken to an abandoned house in Bethany and tortured to death while several people watched.

That’s the thought that haunts her sister.

"In her last moments I'm sure that she was absolutely terrified. 19-year old girl. Helpless,” said Sara Saunders. “It's very hard."

In 2012, Luis Enrique Ruiz and Jimmy Lee Massey Jr. were charged with Saunders’ murder, but the charges were dropped because of a lack of evidence. 

"I don't think we've ever actually gotten a straight forward answer. The only straight forward fact we have is her autopsy report. That's it,” said Sara.

So, an anonymous donor is offering $50,000 dollars if someone sends the video to him before the end of October.

"All of us have kids and I think the big part about it is putting ourselves in that situation of her parents and imagining what they must be going through,” said the donor.

"It's torture to live through this. To have to learn to live without her. And not have answers. But they’re scared for a reason. The people who did this to her, they’re not nice people,” said Sara.

And if no one comes forward with the video or information that will lead to a conviction by the end of October?

"Then we will take that money and we will hire a private detective. If nothing comes from that, then we'll hire 10. If nothing comes from that, then we'll hire 20,” said the donor. “The people that did this should know that their days of being comfortable and their days of thinking they got away with it and that it's forgotten should end immediately."

The donor, who lives in another state, said after he receives the video and verifies it’s authentic, he will pay the $50,000 and forward it to OBI. His e-mail address is dontbeacoward13@yahoo.com.