President Kennedy and first lady Jacqueline Kennedy pose at Georgetown University Hospital in Washington in this Dec. 8, 1960 file photo, with their son, John F. Kennedy Jr., following a baptism for the infant.

John Kennedy Jr. plays in the Oval Office at the White House in Washington, Oct. 15, 1963.

President John F. Kennedy, first lady Jacqueline Kennedy and their children John F. Kennedy, Jr., left, and Caroline Kennedy pose for a family portrait at Hammersmith Farm in Newport, R.I.,Sept. 29, 1961.

Little John climbs steps of helicopter after seeing his father President John Kennedy off at Otis Air Force Base, Mass., Sept. 3, 1963.

President Kennedy approaches a helicopter at the family home in Hyannis Port, Mass., for the first leg of his journey back to Washington, Aug. 26, 1963.

President John F. Kennedy is shown with his son, John Jr., as they hold hands outside the White House in Washington, circa 1963.

President John F. Kennedy, first lady Jacqueline Kennedy and their children, Caroline, right, and John Jr., seated beside his mother, with the family dogs at their home in Hyannis Port, Mass., Aug. 14, 1963.

Jacqueline Kennedy takes her son, John, Jr., and daughter, Caroline, for a ride on "Sardar," her gift horse from President Ayub Khan of Pakistan, Nov. 19, 1962, at Kennedy's Glen Ora estate near Middleburg, Va.

John F. Kennedy Jr. salutes his father's flag-draped casket during the funeral procession for President John F. Kennedy in Washington, Nov. 26, 1963. From left, Edward Kennedy, Caroline Kennedy, Jacqueline Kenney, Robert Kennedy, and John F. Kennedy Jr.

John Kennedy Jr. and Caroline Kennedy sled in Central Park in New York, Jan. 3, 1971.

The family of Sen. Edward Kennedy was joined by John F. Kennedy Jr., center, son of the late U.S. President John F. Kennedy, for a ski week, at several Massachusetts ski resorts, Feb. 1975.

Patrick Kennedy and John F. Kennedy Jr. attend John F. Kennedy Library and Museum Dedication Ceremony, Oct. 20, 1979, in Dorchester, Mass.

John F Kennedy Jr. at Hyannis Beach in Hyannis, Mass., Aug. 30, 1980.

John F. Kennedy Jr. is seen at his graduation from Brown University in this June 4, 1983 photo.

John F. Kennedy Jr. and Carolyn Bessette-Kennedy on their wedding day, Sept. 21, 1996.

John F. Kennedy, Jr. walks his dogs in front of his Tribeca apartment, Oct., 1996, in New York.

John F. Kennedy, Jr. during an interview with Jay Leno on "The Tonight Show," May 14, 1998.

John F. Kennedy Jr., son of the late President John Fitzgerald Kennedy, listens to a question from the audience during a panel discussion entitled "The Medicare Debate: Then and Now" at Harvard University's John F. Kennedy School of Government in Cambridge, Mass., in this April 29, 1997 photo.

John Kennedy Jr. and his wife, Carolyn Bessette-Kennedy, attend the funeral of his cousin Michael Kennedy at Our Lady of Victory Church in Centerville, Mass., Jan. 3, 1998. Michael Kennedy was killed in a skiing accident Dec. 31, 1997, in Aspen, Colo.

Jonh F. Kennedy Jr. stops to talk with, left to right, HBO Chairman and CEO Jeff Bewkes and HBO Senior Vice-President of Corporate Communications Richard Plepler before heading into a screening of "From Earth To The Moon," an HBO Original Production, at the Saturn Rocket Visitors Center in Kennedy Space Center, Fla., March 25, 1998.

John F. Kennedy Jr. during "Newman's Own" George Awards at U.S. Customs House in New York, May 19, 1999.

John F. Kennedy, Jr. gives Carolyn Bessette-Kennedy a kiss during the annual White House Correspondents dinner, May 1, 1999 in Washington, D.C.