S1/EP4 Zahau family attorney Keith Greer shows Paul Holes never-before-seen photos from Rebecca Zahau's autopsy. What Holes sees concerns him.

S1/EP4 Using a crash test dummy and exact mock-up of Rebecca Zahau's room, a team of crime scene experts restage how authorities say she died.

S1/EP4 Investigators have more questions than answers after using a crash-test dummy to try to replicate how police say Rebecca Zahau died.

S1/EP4 Retired cold case investigator Paul Holes sits down with Oxygen.com Correspondent Stephanie Gomulka to talk about the death of Rebecca Zahau. Authorities ruled she died by suicide.

S1/EP4 Authorities ruled Rebecca Zahau’s death was a suicide. The defendant at the civil trial has maintained their innocence and denied any involvement in her death.

S1/EP4 Former investigator Paul Holes notices something odd about the way Rebecca Zahau's hands were bound before her death.

Billy Jensen, Paul Holes and Loni Coombs visit attorney Keith Greer's evidence room to conduct their own investigation of Rebecca Zahau's mysterious death.

S1/EP3 A forensic expert looks closely at the rope Adam Shacknai allegedly cut to release Rebecca Zahau when he found her body. The cut appears consistent with his account of cutting her down.

S1/EP3 Rebecca Zahau's sister, Mary Zahau-Loehner, and friend, Jennifer Watson, explain Zahau's relationship with her ex-husband, Neil Nalepa. Although Nalepa had a "short temper," there is "no way" he could have been responsible for Zahau's death, they say.

S1/EP3 Adam Shacknai appeared very nervous during his polygraph test after the death of Rebecca Zahau. Former prosecutor Loni Coombs says that, while worth noting, it's also important to remember that Adam's affect may just be his way of responding to trauma.

S1/EP2 Former prosecutor Loni Coombs and investigative journalist Billy Jensen observe outside the Spreckels Mansion, where Rebecca Zahau and Max Shacknai died, on a quiet night, noting the "eerie feeling." The investigators agree that neighbor Marsha Alison could well have heard the screaming she told the sheriff's office she heard on the night Zahau died in 2011.

S1/EP2 Loni Coombs and Billy Jensen started investigating Rebecca Zahau's death expecting answers, but as they learn more, they just face a 'hall of mirrors.' Coombs says she wants to know for sure if Zahau's death was a suicide, but need to start looking at potential suspects, in case it was not.

S1/EP2 Former prosecutor Loni Coombs and investigative journalist Billy Jensen listen to Rebecca Zahau's voice for the first time on a voicemail she left for a detective after Max Shacknai's accident. Zahau sounds like she was "keeping it together," they say.

S1/EP2 Investigative Journalist Billy Jensen sits down with Oxygen.com Correspondent Stephanie Gomulka to talk about the death of Rebecca Zahau. Authorities ruled she died by suicide.

S1/EP2 Retired criminal investigator Paul Holes says the sheriff's department may not have been thorough in investigating Rebecca Zahau's death. Noting "unusual" details of the scene, Holes says that the evidence did not prove that an offender was not present the night Zahau died.

Investigative journalist Billy Jensen says he has been stonewalled by the San Diego Sheriff's Department when seeking information on Rebecca Zahau's mysterious death. An experienced online sleuth, he plans to use social media to track down potential witnesses who were in Coronado the night Zahau died in 2011.