Marimón was killed on 31 July 1954 during practice for the 1954 German Grand Prix, becoming the first driver to be fatally injured at a World Championship Grand Prix other than the Indianapolis 500.
Marimón morreu o 31 de xullo de 1954 durante a práctica para o Gran Premio de Alemaña de 1954, converténdose no primeiro piloto en resultar mortalmente ferido nun Gran Premio do Campionato do Mundo que non foran as 500 Millas de Indianápolis.