Joe Hunter competed on "Survivor" to honor his late sister. Now he's on a mission to prove she was murdered.

On a beach in Fiji competing on "Survivor," the reality show that, like "48 Hours," airs on CBS, Joe Hunter's grief over the death of his sister Joanna came out in full force.JOE HUNTER ("Survivor" season 48): I miss you so much.I just miss you so much. JOE HUNTER ("Survivor" season 48): I am so sorry for the things I said.
… And I never got the chance to say "I love you." So, "I love you."Joe is still grappling with how she died.DISPATCHER: 911, What's your emergency? CHURCH MEMBER: … I think someone's dead. A 911 call was made on Oct.6, 2011 at 9:25 p.m.
in Vacaville, California.CHURCH MEMBER: My pastor just came out of the house, and he's really, really upset and he told me to call the cops.He thinks his wife's dead …DISPATCHER: What's his name? CHURCH MEMBER: His name is Mark Lewis.DISPATCHER: Can I talk to Mark?DISPATCHER: … Can you tell me what happened?MARK LEWIS: I have no clue what happened …MARK LEWIS: Oh, I don't want to talk about it.
… I don't want to talk about what she looks like.THE SCENE AT JOANNA'S HOUSEIt was a terrible sight.Mark Lewis' 36-year-old wife Joanna hanging inside a bedroom closet.MARK LEWIS (to 911): Send somebody out here quick.
DISPATCHER: Mark, they're on the way, honey.14 minutes later, at 9:39 p.m., according to the Solano County Sheriff's report, a deputy was on the scene. Captain Jackson Harris reviewed the case with "48 Hours."Capt.Jackson Harris: He cut her down … tried to find any signs of life.
… There were not any signs of life that were there, unfortunately.A bathrobe sash had been the noose.The deputy's report said, "he did not observe any signs of a struggle." There was an open suitcase and a note.Capt.
Jackson Harris: I believe the note said, take care of the dogs.Had Joanna taken her own life? Mark Lewis, the 36-year-old pastor of The Fellowship Baptist Church, was handcuffed, placed in the back of a patrol car, and briefly quest...