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A "Survivor" contestant believes his sister was murdered and is determined to be her voice. "48 Hours" contributor Natalie Morales reports.

Morgan Metzer is attacked in her home by a masked intruder disguising his voice to sound like Batman. Her ex-husband comes to her aid, but is he a hero? "48 Hours" contributor Nikki Battiste reports.

"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.

A beloved doctor and his family are murdered. A suspect emerges with a fantastical story of shadowy figures and intrigue straight out of a spy thriller. "48 Hours"' Natalie Morales reports.

A boxer is shot and stabbed by her husband but refuses to go down for the count. CBS News contributor David Begnaud reports.

The brutal murders of four teenage girls has haunted Austin, Texas, for 30 years. Could new information lead to a killer? "48 Hours" correspondent Erin Moriarty has reported on the case from the beginning and has the latest on the search for answers. ...

48 Hours" can exclusively report there has been a huge break in the 1991 murders of four teenage girls in a Texas yogurt shop.

Could new information lead to answers in the brutal murder of four teenage girls in Austin, Texas, more than 30 years ago?

The 2011 death of "Survivor" contestant Joe Hunter's sister was ruled a suicide. But he believes his sister, Joanna Hunter, was murdered. "48 Hours" correspondent Natalie Morales has the story.

ALL NEW: A "Survivor" contestant believes his sister was murdered and is determined to be her voice. "48 Hours" correspondent Natalie Morales reports Saturday, Dec. 13 at 10/9c on CBS and streaming on Paramount+.