On July 13th, 2011, 32-year-old Rebecca Zahau was found dead at her boyfriend’s California mansion. The young woman was hanging from a balcony naked, gagged and with her hands and feet bound. Her wealthy boyfriend’s brother, Adam Shacknai, who was staying in the mansion’s guest house at the time of her death, discovered her body.

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After a seven-week investigation, Zahau's death was officially ruled a suicide. Her boyfriend, Jonah Shacknai, claimed she took her own life because she felt responsible for serious injuries, including brain damage, his son suffered while in her care.

WATCH: Why Rebecca Zahau’s Family Says They Chose To Exhume Her Body For A Second Autopsy

Zahau’s family says she would never have taken her own life. Her sister, Mary, and brother-in-law, Doug, claim now, as they did when they first appeared on Dr. Phil, that the evidence proves foul play, and that they believe Adam Shacknai killed Rebecca.

Watch more of the story in the video above. And on Tuesday’s episode of Dr. Phil, Zahau’s family shares details of the trial for the first time since Adam Shacknai was found responsible for her death in a wrongful death civil suit. Check here to see where you can watch.

Adam Shacknai maintains that he is innocent of any wrongdoing and did not kill Rebecca Zahau.

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Civil Trial Ends With Man Found Responsible For Death Of His Millionaire Brother’s Girlfriend