Hagiwara was killed during a private testing session at
Sportsland SUGO on Monday, 7 April 1986. Piloting a
Mercedes-Benz 190E 2.3-16V operated by
Leyton House Racing, Hagiwara crashed in Turn 2 (now called Rainbow Corner). The car then engulfed in flames, trapping the 29-year-old driver inside. Originally, Hagiwara was not supposed to test on Monday as he had entered the opening race of the All Japan Endurance Championship held on Sunday, 6 April 1986 (the International Suzuka 500km held at
Suzuka Circuit). However, the
Nissan R86V, which was scheduled to race in Suzuka, suffered from a mechanical problem during free practice and was unable to participate in the race. Hagiwara thus changed his schedule and headed for Sportsland SUGO which led to the fateful testing session. After his death,
Aguri Suzuki was chosen to replace Hagiwara for the
1986 24 Hours of Le Mans in the #23
Nissan R86V entry. ==Racing record==