The inventor of McDonald's iconic Big Mac has died.
Michael Delligatti, who was known as "Jim," died Monday night in Pittsburgh at the age of 98.
Delligatti was one of McDonald's first franchisees.
He made an indelible impact on American cuisine with the creation of the Big Mac burger in 1967 at his Uniontown, Pennsylvania restaurant.
Delligatti made the sandwich by combining two all-beef patties, lettuce, cheese, pickles, and onions, as well as a "secret sauce."
That's the same recipe that's used today for the Big Mac sandwich, which is served in more than 100 countries worldwide.
Delligatti also played an integral role in the development of McDonald's breakfast menu, by creating the Hotcakes and Sausage meal to feel steel workers at the end of their overnight shifts, according to an obituary written by his family that was provided by McDonald's.
He opened his first McDonald's restaurant in 1957 and went on to operate 47 additional locations in Pennsylvania.
"Jim was a legendary franchisee within McDonald's system who made a lasting impression on our brand," McDonald's said in a statement on Delligatti's death. "We will remember Jim as an insightful franchisee, a knowledgeable businessman, and an honorable gentleman who left a legacy of four generations of family members running great restaurants in Pennsylvania and North Carolina."
RELATED: McDonald's through the years
McDonald's through the years
McDonald's through the years
The McDonald's Museum is a replica of the first corporate McDonald's restaurant, opened here April 15, 1955, after the franchise was acquired from founders Maurice and Richard McDonald.
circa 1955: Exterior view of the first McDonald's fast food restaurant with its neon arches illuminated at night, Des Plaines, Illinois. (Photo by Hulton Archive/Getty Images)
The exterior of a McDonald's fast food restaurant is shown in this August 1970 photo. The 'Speedee' McDonald's in Downey, California, named for the original chef logo, the third restaurant built by the McDonald brothers Dick and Maurice has been designated a national landmark and celebrated its 50-year anniversary on August 18, 2003 in Downey, California. (Photo by Hulton Archive/Getty Images)
Restaurants McDonald. March 23, 1974. (Photo by Arty Pomerantz/New York Post Archives / (c) NYP Holdings, Inc. via Getty Images)
An employee makes notes at the counter in McDonald's, Southfield, Michigan, USA, July 1978. (Photo by Barbara Alper/Getty Images)
A McDonald's restaurant in Vienna, Austria, July 1980. (Photo by Barbara Alper/Getty Images)
Fast food also known as the junk food phenomenon arrived in France, the country of gastronomy in the late seventies early eighties. Hamburgers, cheeseburgers, french fries, Coca Cola or Pepsi and milk shakes with the interior decoration and design of the premises in the same atmosphere as in the USA. The beginning of fast food in France started with such companies such as Whataburger, Love Burger, Manhattan Burger, Big Boy, Popeye Burger, Freetime, Burger King and Mcdonald's. Employees at Burger King. (Photo by John van Hasselt/Corbis via Getty Images)
Fast food also known as the junk food phenomenon arrived in France, the country of gastronomy in the late seventies early eighties. Hamburgers, cheeseburgers, french fries, Coca Cola or Pepsi and milk shakes with the interior decoration and design of the premises in the same atmosphere as in the USA. The beginning of fast food in France started with such companies such as Whataburger, Love Burger, Manhattan Burger, Big Boy, Popeye Burger, Freetime, Burger King and Mcdonald's. Employees at Whataburger. (Photo by John van Hasselt/Corbis via Getty Images)
Interior view of a McDonald's restaurant, showing an employee sweeping the floor and a group of patrons eating, Chicago, Illinois, circa 1987. (Photo by Antonio Perez/Chicago History Museum/Getty Images)
123241 05: A Worker Takes An Order From A Customer In China's First Mcdonald's Restaurant April 23, 1992 In Beijing, China. Mcdonald's Opened Its World's Largest Restaurant In The Busiest Shopping District Of The Capital. (Photo By Forrest Anderson/Getty Images)
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Marquee of a McDonald's restaurant in Times Square. (Photo by James Leynse/Corbis via Getty Images)
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AUSTRALIA - OCTOBER 18: A McDonald's restaurant sign is cast in light at sunset on a road between Canberra and Sydney, Australia, Wednesday, October 18, 2006. (Photo by Jack Atley/Bloomberg via Getty Images)
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A McDonald's employee serves a burger and a carton of french fries at one of the company's restaurants in London, U.K., on Monday, Feb. 1, 2010. McDonald's Corp., the world's largest restaurant company, plans to increase its number of Russian outlets by 20 percent this year to capitalize on its fastest growing market in Europe. Photographer: Jason Alden/Bloomberg via Getty Images
The world's biggest McDonald's in the Olympic Park during the London 2012 Olympics. or the past 40 years McDonalds has been the Official Restaurant Olympic Games. All official sponsors they have paid $957 million to the IOC for the 19 days competition. Hundreds of food outlets at Olympic venues have been forced to take chips off the menu, because of a demand from sponsor McDonald's. Olympic chiefs banned all 800 food retailers at the 40 Games venues across Britain from dishing up chips because (Photo by In Pictures Ltd./Corbis via Getty Images)
SAN RAFAEL, CA - MARCH 12: Customers order food at a McDonald's restaurant drive thru on March 12, 2013 in San Rafael, California. McDonald's has retained its number one ranking in both global and domestic sales and continues to be the largest single restaurant brand in the world with company-store sales last year of $4.53 billion and franchise-store sales of $31.063 billion for a domestic total of $35.59 billion. (Photo by Justin Sullivan/Getty Images)
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