SAN DIEGO -- The results of a second autopsy aimed at clearing the air around the suicide of Rebecca Zahau at Coronado's historic Spreckels mansion will be discussed on the "Dr. Phil" television show on Thursday.

Zahau, 32, hanged herself July 13 a couple of hours after learning that her boyfriend's 6-year-old son, injured in a July 11 fall while in her care, was brain dead and would not live.

Zahau, found nude with her hands and feet bound, was cut down by the brother of Jonah Shacknai, founder and chief executive of Scottsdale, Arizona based Medicis Pharmaceutical Corp.

And though the San Diego County Medical Examiner ruled the death a suicide, some members of Zahau's family questioned the finding.

A second autopsy was done by renowned pathologist Dr. Cyril Wecht, and one of Zahau's sisters has been cooperating with TV psychologist Phil McGraw to explain what may have happened. The show is set to air at 3 p.m. on KFMB Channel 8.

Max Shacknai, injured in a fall from a second-floor landing, was allowed to die a few days after Zahau's suicide.