The 36-year-old, from south-east England, collapsed between miles 23 and 24, London Marathon Events said in a statement.
The man received immediate medical attention and an ambulance arrived within three minutes.
However, he later died in a London hospital.
London Marathon Events issues statement after man dies
In a statement, London Marathon Events expressed their “sincere condolences” to the man’s friends and family.
“Everyone involved in organizing the London Marathon would like to offer their sincere condolences to their family and friends,” they said.
They added that the man’s family had asked for privacy at the time.
The cause of death has yet to be determined.
The man was one of more than 40,000 people who set out for the annual 26.2-mile run from Blackheath in south-east London to the finish line in The Mall.
Organizers said the race will return to its traditional spring venue in 2023, with voting open until 9pm on October 7 for the courses scheduled to take place on April 23.
https://www.theargus.co.uk/sport/23017022.london-marathon-organisers-issue-statement-man-36-dies-collapsing-race/?ref=rss London Marathon organizers issue a statement as the 36-year-old man dies after collapsing during the race