[MTW]

Giuseppe Farina. "On his way to the 1966 French Grand Prix, Farina lost control of his Lotus Cortina in the Savoy Alps, near Aiguebelle, hit a telegraph pole and was killed instantly" (after his retirement from Formula one, of which he had a long history of accidents which although he was badly injured in many of, recovered to race to the end of his career)

Graham Hill also drove his whole career in F1 through the most dangerous period but ended up dying in a plane after retiring from the driving-side of F1.

Graham Hill. "On 29 November 1975, Hill was piloting his Piper PA 23-250 Turbo-Aztec with five other members of the Embassy Hill team aboard; they were returning to England after car testing at the Paul Ricard circuit in the south of France. While attempting to land at Elstree Airfield near London at night in heavy fog, the plane struck trees and crashed on Arkley golf course,[5][16][6][17] bursting into flames on impact."

David Purley, "Purley is best known for his actions at the 1973 Dutch Grand Prix,[1] where he abandoned his own race and attempted to save the life of fellow driver Roger Williamson, whose car was upside down and on fire following a serious accident. Purley was awarded the George Medal for his courage in trying to save Williamson, who suffocated in the blaze."

"It was this car in which he suffered serious injuries in an accident during practice for that year's British Grand Prix. He survived an estimated 179.8 g when he decelerated from 173 km/h (108 mph) to 0[5] in a distance of 66 cm (26 inches)[citation needed] after his throttle became stuck wide open and he hit a wall. This was the highest measured g-force ever survived by a human being"

"He died on 2 July 1985 when his Pitts Special aerobatic biplane crashed into the English Channel off Bognor Regis."

Then of course, Michael Schumacher's skiing accident. (though of course he isn't dead but it's very much in line with accidents after F1).

Conclusion; I just thought it pretty sad that so many drivers seemed to make it through F1 only to have some other accident outside of it. I guess you could simply put it down to them being adrenaline-junkies, in all these examples it seems they themselves were somehow involved in causing the crash. (though don't quote me on that)...(all info from wiki)