Last year the then Prince Filip completed the course in 1 hour 55 minutes. The king wasn't supposed to be taking part this year due to a busy agenda, but the king turned up after all.
The participants included a record number of runners, hand bikers and walkers this year. The race started in the Jubel Park in Brussels at 10am.
The race is being organised for a 35th time this year.
Brussels police have confirmed that one 28-year-old participant died in sight of the finish. A further four others were taken to hospital with heart problems. In all Red Cross workers helped over 600 people. 430 Red Cross workers had been deployed as well as 6 medical teams. 35 people were hospitalised.