Walter Foxcroft, 43, was found dead inside a hyperbaric chamber at the Arizona facility he co-founded last year.

ARIZONA — Health officials have reported the first plague death since 2007, according to CBS News and the AP. Plague is generally rare in humans, as an average of seven cases are reported annually in the United States. The person who most recently died had the pneumonic plague and lived in Coconino County, Arizona.

An Arizona resident has died from the plague as officials were probing whether a prairie dog die-off in the area was also tied to the lethal illness.