"After attacking German shipping at Ostend and strafing three German airfields on July 15th, 1942, Finucane’s wing regrouped to return to Hornchurch. As the group passed low-level over the beach at Pointe Du Touquet, Finucane’s Spitfire was hit by machine gun fire that severely damaged his radiator. The engine overheated and quit, and the Spitfire was too low to allow Finucane to bail out. Losing altitude swiftly, Paddy was heard to say; “This is it, Chaps.” Witnesses reported that after a near perfect "splash" the Shamrock-Spit sank like a stone, and despite all efforts, was never to be seen again. At the time of his death, Wing Commander Finucane’s score stood at an amazing 32 victories."
Found this here:
http://www.acesofww2.com/UK/aces/finucane/
My opinion is, that the engine in case of damage should overheat after like 5 minutes. But that is an opinion, not something based on facts...