A coroner says Jeremy Carter, the grandson of former President Jimmy Carter, has died near Atlanta.

Fayette County Coroner C.J. Mowell Jr. told The Associated Press on Monday that his office is still investigating the death. Mowell said the cause of death is not yet known, and the state medical examiner's office is assisting in the investigation.

The Atlanta Journal-Constitution reported that Jimmy Carter announced the death Sunday to the congregation of the former president's hometown church in Plains. The newspaper says Carter told parishioners his 28-year-old grandson hadn't been feeling well Saturday and went to take a nap at his family's home in Peachtree City before he died.

Mowell said he was notified of the death early Sunday.

Peachtree City is about 30 miles southwest of Atlanta.