Mary says for the last seven years, she has been fighting for justice for her sister, Rebecca Zahau. She claims her sister was murdered by Adam Shacknai, brother of Zahau’s wealthy boyfriend, which contradicts the police findings that Zahau, who was found naked, bound and hanging from a balcony, died by suicide, distraught after her boyfriend’s son was injured two days prior while in her care and later died.

TELL DR. PHIL YOUR STORY: Are you involved in a story that has made the headlines?

In an exclusive interview with Dr. Phil airing Tuesday, Mary, her husband, and their attorney, Keith Greer, share details from the trial for the first time since Shacknai was found civilly liable for Zahau’s death. In the video above, Greer describes the events they allege led to Zahau’s death. Hear what he claims makes them believe she was fighting and trying to escape before her death.

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

On Tuesday’s episode, hear the 911 call Shacknai placed and why Mary claims it proves he was lying. Check here to see where you can watch.

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

TELL DR. PHIL YOUR STORY: Have a story Dr. Phil won't believe?

Hear The 911 Call Made After Rebecca Zahau’s Naked Body Was Found Hanging – And What Her Sister Claims It Proves