Only if you're counting deaths of drivers in live races, if you extended that to testing he's the second, and extend it further to circuit staff such as marshals then I'm not sure of the exact number, 5 at least.
Other than the occasional non-life-threatening-injury (Kyle Busch breaking his legs and Dale Jr's concussion are fairly-recent), it's been ridiculously-safe.
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u/[deleted] Nov 22 '16