Family, friends and fans have gathered at St. Stephen’s Cathedral in Vienna for a last farewell to Formula One great Niki Lauda.

The wooden coffin of the three-time champion was decorated Wednesday with his red racing helmet and surrounded by six white candles, with two larger-than life portraits of Lauda behind it. The Austrian died May 20 at age 70, less than a year after undergoing a lung transplant.

Lauda, who won two of his Formula One titles after a horrific crash in which he suffered serious burns, later became a prominent figure in the aviation industry and in recent years served as a non-executive chairman of the Mercedes F1 team.

Birgit Lauda, center, widow of the former formular Formula One driver Niki Lauda, attends a funeral service for Lauda in Vienna, Austria, Wednesday, May 29, 2019. Three-time Formula One world champion Niki Lauda, who won two of his titles after a horrific crash that left him with serious burns and went on to become a prominent figure in the aviation industry, has died on May 21, 2109. He was 70. (AP Photo/Ronald Zak)
Birgit Lauda, center, widow of the former formular Formula One driver Niki Lauda, attends a funeral service for Lauda in Vienna, Austria, Wednesday, May 29, 2019. Three-time Formula One world champion Niki Lauda, who won two of his titles after a horrific crash that left him with serious burns and went on to become a prominent figure in the aviation industry, has died on May 21, 2109. He was 70. (AP Photo/Ronald Zak)

Austrian President Alexander Van der Bellen, Arnold Schwarzenegger and several Formula One stars were expected to attend the service.

Birgit Lauda, 2nd right, widow of the formular Formula One driver Niki Lauda, attends a funeral service for Lauda in Vienna, Austria, Wednesday, May 29, 2019. Three-time Formula One world champion Niki Lauda, who won two of his titles after a horrific crash that left him with serious burns and went on to become a prominent figure in the aviation industry, has died on May 21, 2109. He was 70. (AP Photo/Ronald Zak)
Birgit Lauda, 2nd right, widow of the formular Formula One driver Niki Lauda, attends a funeral service for Lauda in Vienna, Austria, Wednesday, May 29, 2019. Three-time Formula One world champion Niki Lauda, who won two of his titles after a horrific crash that left him with serious burns and went on to become a prominent figure in the aviation industry, has died on May 21, 2109. He was 70. (AP Photo/Ronald Zak)
The helmet of former formular Formula One driver Niki Lauda, is placed on top of his coffin during a funeral service in Vienna, Austria, Wednesday, May 29, 2019. Three-time Formula One world champion Niki Lauda, who won two of his titles after a horrific crash that left him with serious burns and went on to become a prominent figure in the aviation industry, has died on May 21, 2109. He was 70. (AP Photo/Ronald Zak)
The helmet of former formular Formula One driver Niki Lauda, is placed on top of his coffin during a funeral service in Vienna, Austria, Wednesday, May 29, 2019. Three-time Formula One world champion Niki Lauda, who won two of his titles after a horrific crash that left him with serious burns and went on to become a prominent figure in the aviation industry, has died on May 21, 2109. He was 70. (AP Photo/Ronald Zak)