A "Survivor" finalist's mission to prove his late sister was murdered

"Survivor" 48 contestant Joe Hunter believes his sister Joanna, whose death was ruled a suicide, was murdered. He and their mother are working to be Joanna's voice and advocate for others who have experienced domestic violence.

source https://www.cbsnews.com/news/joe-hunter-survivor-joanna-hunter-death-mark-lewis-california/