A 94-year-old spectator at the U.S. Open died Friday of natural causes, according to the United States Golf Association (USGA).

The USGA released a statement confirming the death.

“The USGA was saddened to learn that a spectator at Erin Hills passed away a short time ago,” the USGA statement said. “Out of respect for the family, we are unable to provide additional information at this time. Our thoughts and prayers are with those surrounding this individual during this difficult time.”

The medical examiner was called around 2 p.m. to the scene, according to the Washington County Sheriff’s Office.

This is the second issue pertaining to spectators this week at the U.S. Open, which is being played on Erin Hills golf course in Wisconsin. E. coli bacteria was found Thursday in a hydration station by the course’s 12th hole, according to USA Today. No symptoms of possible infections have been reported yet.

The bacteria was found after a blimp caught on fire and crashed Thursday afternoon. The blimp’s pilot, who was the only person on the blimp, is in critical condition after suffering serious burns.