The Sun-Sentinel newspaper of Fort Lauderdale reports that the boat capsized early Thursday afternoon just outside Hillsboro Inlet.
The Broward County Sheriff's Office confirmed the woman's death.
Pompano Beach Fire Rescue spokeswoman Sandra King said the boat's 21 divers and 2 crew members were heading back to the dock after a day of diving. She said rescue crews found the 45-foot-long catamaran "in pieces, upside down in the water." Lifeguards used wave runners to start rescuing passengers of the dive boat, identified as the Coral Princess and owned by South Florida Diving Headquarters. All aboard had been accounted for.