Jody Powell, who served as press secretary to former President Jimmy Carter and later went on to form the public affairs firm Powell Tate, died Monday, his office confirmed. The cause of death was not immediately known, though ABC News is reporting he had a heart attack.Powell, 65, was chairman of Powell Tate. According to the firm’s bio, Powell joined Carter’s successful gubernatorial campaign in 1970. In November of that year, Powell became Carter’s press secretary, a role he held through the end of Carter’s presidential term in 1981.Powell formed Powell Tate with Sheila Tate, who was press secretary to first lady Nancy Reagan.