◆6 sources
Marathon skater Jan Roelof Kruithof, known as the Diesel of Havelte, died aged 89, his family reported. He was from Havelte and won the Alternative Elfstedentocht nine times and the Oldambtrit four times.
1 source
Jan Roelof Kruithof died at the age of 89, according to confirmation from his family. The architect from Havelte won the Alternative Elfstedentocht 11 times between 1974 and 1991, including eight races on frozen lakes in Finland.
2 sources
Jan Roelof Kruithof died on Saturday at the age of 89. The natural-ice marathon skater, who was born in Ouwsterhaule, was described as nearly unbeatable in his best years but never won the Elfstedentocht.