On September 13, 1982, Princess Grace was returning with her daughter Stephanie to Monaco from a retreat at a family estate in France. While driving on the winding, narrow road, Grace suffered a stroke and caused a car crash. While Stephanie sustained several significant injuries, Grace was gravely injured. She was pronounced dead the next evening, at age 52.Historical
Links: en.wikipedia.org, findadeath.com
v good map, but the accident actually happened in the next curve, where the house and the gardens are.
However, this particular curve is also of significance as this is where the fanous picnic scen in "To catch a thief" took place!