Meanwhile, Bremner came forward Wednesday with new reports from witnesses in the Coronado neighborhood.
"We are now confirming information from a witness that there may have been a cry for help from a woman in the mansion around 11:30 p.m. the evening prior (to Zahau's death)," Bremner said. "So that's important in terms of the time of death and in terms of the surrounding circumstances."
Bremner said her private investigation on behalf of the Zahau family also uncovered a mystery woman spotted at the Spreckels mansion an hour or so earlier that same evening.
"There also was a witness who spoke to law enforcement who indicated that they saw a person outside the house at the 10 o'clock hour," Bremner said, referring to the evening of July 12. "I think it's important information in the investigation in determining whether this is a suicide or a homicide."
None of the reported witness accounts were confirmed by Sheriff's investigators.