The attorney also said evidence on a bloody knife indicates it was used to sexually assault Zahau.
"I got almost nauseous, It's already heinous what happened here to be stripped naked, bound gagged … it's already terrible. It seemed like it couldn't get any more shocking. My stomach flipped," Greer said.
Zahau's death has captured headlines since she was discovered hanging nude from the second balcony of the Spreckels Mansion in Coronado six years ago.
This was just a couple days after her boyfriend's son, Max, fell down some stairs and died in what was considered an accident. At the time, Max was under Zahau's care.
When asked about the recent documents filed in court, a spokesperson for the Sheriff's Department said they are looking into it. The department will release an official comment once they have time to review the information.
Attorneys for Adam Shacknai did not respond to a request for a comment.