His American co-driver , Sergio Cresto , also died when the Lancia plunged down a ravine and exploded .
Toivonen , driving a Lancia Delta S4 , died in an accident on May 2 , 1986 while leading the Tour de Corse rally in Corsica .
Toivonen 's American co-driver , Sergio Cresto , also died when the Lancia plunged down a ravine and exploded .
Toivonen , driving a Lancia Delta S4 , died in an accident on May 2 , 1986 while leading the Tour de Corse rally in Corsica .