Jimmy Carter 's grandson Jeremy died suddenly on Sunday, after suffering a heart attack in front of his mother, who performed CPR and tried desperately to save him, according to an emotional blog post by his brother Josh.
Jimmy, who announced he was cancer-free during another Sunday school class earlier this month, told the church that his grandson wasn't feeling well when he went to take a nap at his family's Peachtree City, Georgia, home on Saturday.
Jeremy's cause of death is still unknown and the case is currently under investigation, Fayette County Coroner C.J. Mowell Jr. told The Associated Press on Monday.
Opening up to his Sunday school class just hours after Jeremy's death, Jimmy described his grandson as "a very special child" and "a wonderful young man whom we loved very much," NBC News reports.