Residents and rescue teams navigate floodwaters on October 10, 2016 in Lumberton, North Carolina.

Twenty people in North Carolina have been killed by floodwaters and tens of thousands remained without power after Hurricane Matthew swamped the state with record rains, the governor said Wednesday.

Another death was confirmed Wednesday afternoon, Gov. Pat McCrory said, telling reporters: "I cannot emphasize enough to stay away from the water. It will kill you."