It's been a month since Mizzou student Riley Strain first vanished in downtown Nashville and was found two weeks later in the Cumberland River. Now, the family has raised questions about potential video footage from cameras belonging to a detention center that was just north of where the last ping registered on Strain's phone. Family friend Chris Dingman joined "Elizabeth Vargas Reports" to discuss the family's interest in accessing the footage. #RileyStrain #Nashville #truecrime Anchor Elizabeth Vargas delivers the biggest stories, without bias or opinion. Watch "Elizabeth Vargas Reports" every weeknight at 6p/5C on NewsNation. #VargasReports NewsNation is your source for fact-based, unbiased news for all America. More from NewsNation: newsnationnow.com Get our app: trib.al/TBXgYpp Find us on cable: trib.al/YDOpGyG How to watch on TV or streaming: trib.al/Vu0Ikij