A man in North Carolina died on Monday after he went swimming in a lake and was infected by Naegleria fowleri, a single-celled organism known as the “brain-eating amoeba.”

The man, Eddie Gray, 59, fell ill after he visited the Fantasy Lake Water Park in Cumberland County July 12, the North Carolina Department of Health and Human Services said in a statement on Thursday.

Naegleria fowleri infections are rare, but deadly. There were 145 known infected people in the United States from 1962 through 2018, and all but four cases were fatal.

The amoeba is typically found in warm freshwater, and the majority of cases in the United States have occurred in Florida and Texas.