Joe Hunter

Casey Gwynn and Gail Strack, who helped write Joanna's Law, are using her case to spotlight the connection between suspicious deaths and domestic violence.

At this conference in Denver, they're guiding law enforcement officers on how to identify those 10 red flags that could reveal hidden homicides.

48 Hours has learned the California Department of Justice has agreed to review the Solano County DA's decision not to bring criminal charges related to Joanna's death.

The hunters hope that will move the case forward.

I look at it this way.

Nothing can be kept in the dark forever.

Joe's wife, Katie, is a sideline reporter for the Sacramento Kings and a former player in the WNBA.

She experienced domestic violence herself in a teenage relationship.

Have you talked to your daughter about domestic abuse?

In the most basic form, she's six right now.

Wait, Dad, that's just what I need.

but we talk to her about how you treat others and how you should be treated, and that will evolve over time.

But it's also conversations that we have with JoJo, with our son, because it is our responsibility to also teach him what is acceptable behavior and treatment of women, period.

Joe's tribute to Joanna on Survivor season 48.

Moved millions.

This spring, he'll compete again in a landmark season 50 to celebrate the game, which will also keep attention on his sister's case.

In advocating for his sister, he's advocating for other victims, other women.

and our daughter's gonna be so proud of it, our son.

For as long as she's able, Patricia will tell Joanna's story, often at the Sacramento Family Justice Center, a resource for survivors of domestic violence.

They hope Joanna's law and Joanna's light will help save lives and shine the way forward for survivors of domestic violence.