The Miami-Dade Fire and Rescue Service also pulled the body out of the water, the statement said.
A person involved in the collision informed the Coast Guard around 10:30 pm on Friday, announcing 12 people in the water about a mile west of Key Biscayne, according to the statement.
One survivor, who was critically injured, was taken to the Jackson Memorial Medical Center, the Coast Guard said.
Coast Guard crews transferred the remaining survivors to HCA Florida Mercy Hospital, according to the statement.
“On behalf of the Coast Guard and our partner agencies, we would like to extend our sincerest condolences to the families and friends who have lost their loved ones,” the lieutenant said. Commander Benjamin Tuckhorn, Coordinator of the Miami Coast Guard Search and Rescue Mission.
“The Coast Guard and our local partner agencies have responded quickly and worked together on this search and rescue case.”
The Florida Fish and Wildlife Commission is investigating the incident.