Sorry already found it. He suffered a stroke in 2008. Also he was in a deep depression a few years ago. He had to quit his racing team due to lack of sponsorship. Nowadays Henri is still making appearances in vintage F1 cars.
2019 HSO 1996 BTCC Championship 1st
2017 HSO 1996 BTCC Championship 1st
2016 HSO 1973 Indianapolis 500 1st
2015 HSO 1973 Indianapolis 500 3rd
2014 HSO 1988 Deutsche Tourenwagen Meisterschaft 4th