Nancy Reagan through the years

Nancy Davis' 1950 publicity photo. (Publicity photo)

Nancy and Ronald Reagan at New York City's "Stork Club" in the 1950s.

Nancy and Ronald Reagan aboard a boat in California in 1964.

Ronald and Nancy Reagan wave during the 1981 Inaugural Parade in Washington D.C.

Ronald Reagan is sworn in for his second term as president in 1985 as Nancy Reagan looks on.

Ronald and Nancy Reagan in California.

Nancy and Ronald Reagan greet Pope John Paul II in 1982. (AP)

Nancy Reagan blows out her birthday candles on her 94th birthday on July 6, 2015. (Courtesy of The Ronald Reagan Presidential Foundation)

First Lady Nancy Reagan holds the Reagans' pet dog Rex as she and President Ronald Reagan walk on the White House lawn in 1986. (AP)