He also worked as an engineer in the Tatra design bureau in Prague, Czechoslovakia. After he stopped working there, he had established his own car tuning company, called Avon.[2]
On 10 July 1977, during the first lap of the race of the East Germany Touring Car Championship, at the Sachsenring race track, in Hohenstein-Ernstthal, East Germany (now in Germany), his Škoda 130 RS had collided with two others cars, and then crashed into a concrete pole. During the crash, Ondřejík had suffered heavy injuries, and had died later in the evening, in the hospital in Hohenstein-Ernstthal. The race was stopped and cancelled immediately following the crash.[1][2]