According to Carnival's schedule for a six-day cruise, the Dream left Galveston last Sunday, July 20. By Wednesday, the ship was traveling between Belize and Cozumel, Mexico, when multiple passengers reported hearing alarms go off in the middle of the night.

While the medical examiner's office said there were no signs of obvious trauma in the autopsy, the FBI continues to investigate.

The FBI’s Houston field office is “aware of an incident” that took place around July 23 aboard the Carnival Dream, the agency said.