SAN DIEGO -- A woman found dead at a historic mansion was nude and hanging from a balcony with her hands tied behind her back and her feet bound, investigators said Thursday.

Rebecca Nalepa, 32, was discovered at the Coronado home of her boyfriend, Jonah Shacknai, chairman and chief executive of Medicis Pharmaceuticals Corp., an Arizona company that makes acne and facial wrinkle treatments.

Investigators have not determined if Nalepa was a crime victim and have not ruled out suicide, said San Diego County sheriff's Capt. Tim Curran. He declined to comment on the evidence.

"This is a very bizarre death, there's no doubt about it," Curran said at a news conference. "There is roughly 200 years of experience in the sheriff's homicide unit, and they all agree these are very unusual circumstances."

Shacknai's brother, Adam, called 911 Wednesday to report the woman appeared to be dead, Curran said. The brother was staying in a mansion guesthouse.

Curran said sheriff's investigators have not established any connection between the woman's death and a serious injury at the home two days earlier to Jonah Shacknai's 6-year-old son with his ex-wife.

On Monday, paramedics found the boy was not breathing and did not have a pulse after falling down some stairs, said Coronado Police Chief Louis Scanlon.

The boy was being treated at Rady's Children's Hospital San Diego. Hospital spokesman Carlos Delgado declined to comment Thursday on his condition.

"At that time, and at this time, we have no information that would lead us to believe that this is anything other than a tragic accident with the child," Scanlon said.

Jonah Shacknai, 54, founded Medicis and has been chairman and chief executive since 1988. The company, based in Scottsdale, Ariz., declined further comment and asked that the family's privacy be respected.

The 27-room Spreckels mansion was built in 1908 and originally owned by John D. Spreckels, owner of the Hotel del Coronado and the San Diego Union and San Diego Tribune newspapers.