Sergeant Danny Nightingale will try to clear his name at an appeal against his conviction today.
The SAS sniper was jailed for 18 months in November for illegally possessing a pistol, but released three weeks later after appealing his sentence.
At the time, Sgt Nightingale, from Crewe, Cheshire, vowed to clear his name.
His appeal will be heard at the Royal Courts of Justice in London.
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The man was fatally injured on the R125 between Swords and Ashbourne.
More than two million men are buried in the region.
After another chilly start for early risers, temperatures will soon climb under the strong June sunshine.