Investigators on Sunday were looking into the circumstances surrounding the death of a woman killed after the boat she was passenger in slammed into concrete pilings underneath the MacArthur Causeway bridge.

Janette Africano, 35, of Hialeah, suffered severe blunt trauma to the head or body and died Saturday afternoon after being rushed to Jackson Memorial Hospital’s Ryder Trauma Center.

An autopsy will determine the exact cause death.

Africano and her boyfriend had been pleasure boating minutes before the 5 p.m. accident on the Intercostal Waterway near PortMiami, authorities said.

The accident occurred as the couple, traveling in an 18-foot white and red boat, were heading south. As they approached the MacArthur bridge, there was a cruise ship making a turn ahead of them. At that point, the couple decided to turn back north, said Florida Fish and Wildlife Conservation Commission spokesman Jorge Pino on Sunday.

But the currents near the bridge were rough and the couple began drifting toward the pilings. Africano may have stood up and tried to stop the boat from colliding. Somehow the boat violently slammed into the piling, fatally injuring her.

Why the boat roared out of control is under investigation, Pino said. He said the accident is considered “unusual“ because it involves a single boat and neither excessive speed or alcohol appear to be a factor.

No charges have been filed as of Sunday as investigators piece together what occurred.

“We’re looking at every possible cause, including mechanical failure and the experience of the driver,” Pino said.