After being passed over for succession as Aga Khan, he served as the Permanent Representative of Pakistan to the United Nations from 1958 to 1960, where he became a vice president of the General Assembly.

In 1939, Prince Aly Aga Khan joined the French Foreign Legion and served with its cavalry division in Egypt and the Middle East.

In November 1957 Aly Khan met President Iskander Mirza of Pakistan and was offered a post as the country's Ambassador to the United Nations.

[5] As a member of the United Nations Political and Security Committee representing Pakistan, Aly Khan's brief U.N. posting was viewed with surprise by many observers, some of whom considered him "the Asian-African answer to Irene Dunne", an American movie star not known for her political skills; Dunne had recently been designated a member of the United States delegation at General Assembly, largely in recognition of her Republican fundraising efforts.

He was elected as vice president of the United Nations General Assembly on 17 September 1958 and also served as chairman of the U.N.'s Peace Observation Committee.

[citation needed] The couple also had a second son, Prince Amyn Muhammad Aga Khan, who was also born premature at seven months the following year.

[11] After the divorce, Joan Barbara became the longtime mistress and eventual wife of the newspaper magnate Seymour Berry, 2nd Viscount Camrose.

There isn't any amount of money in the entire world for which it is worth sacrificing this child's privilege of living as a normal Christian girl here in the United States.

After a year-long engagement, Tierney separated from the Prince and moved back to the United States to tend to her mental health.

[17][18] In the late 1950s Aly was known to start dating the fashion model Simone Micheline Bodin (who called herself Bettina Graziani).

[21] According to the Aga Khan's will, a statement of which was presented to the press by his secretary: In view of the fundamentally altered conditions in the world in very recent years due to the great changes that have taken place, including the discoveries of atomic science, I am convinced that it is in the best interests of the Shia Muslim Ismaili community that I should be succeeded by a young man who has been brought up and developed during recent years and in the midst of the new age, and who brings a new outlook on life to his office.

Noel Murless the Champion Trainer on multiple occasions in England told his biographer "Apart from his immense charm, Prince Aly was also highly intelligent, a first-class judge of a horse and of form and breeding.

[23] On 12 May 1960, a little more than two years after his appointment as Pakistan's Ambassador to the UN, Aly Khan sustained catastrophic head injuries in an automobile accident in Suresnes, France, a suburb of Paris, when the car he was driving collided with another vehicle at the intersection of boulevard Henri Sellier and rue du Mont Valerien, while he and his pregnant fiancée, Bettina, were heading to a party.

[24] Aly Khan was buried on the grounds of château de l'Horizon, his home in the south of France, where it was intended that he would remain until a mausoleum was built for him in Syria.

Lucille P. Markey, owner of Calumet Farm Thoroughbred racing stable in Lexington, Kentucky, named one of her outstanding colts, "Alydar" in his honor because she always addressed the prince as, "Aly Darling".

In the 20 May 2012 episode of Mad Men, Don Draper mentions that he thought Joan Harris was seeing Aly Khan, given the frequency of flower deliveries to her office.

Later on in the episode, Joan Harris receives a bouquet of red roses (purportedly from Don Draper) with a note that says "Your mother did a good job – Ali Khan."

In a Honeymooners episode titled "The Golfer", which first aired on 15 October 1955, Alice Kramden – when her husband Ralph needs an excuse to not go golfing with his boss – exclaims, "Sure, you can always tell him you're going tiger hunting with Aly Khan."