The subsequent NTSB investigation reconstructed a troubling chain of human factors. Radar data and witness reports showed Horner performing multiple low‑altitude turns, flying through Quatal Canyon and skimming ridgelines at heights sometimes under 100 feet — behavior described by investigators as an inability to maintain terrain clearance during low‑level flight. Toxicology detected butalbital and codeine (prescription pain and headache medications) and ethanol in his system; the NTSB cited use of those medications as a significant contributing factor, while noting the ethanol may have been from postmortem microbial activity. The accident report emphasized how a celebrated artist’s private hobby paired with risky piloting choices and impairing medications produced a sudden, avoidable tragedy that not only ended a career of more than 160 film scores but left family, collaborators and the film community to grapple with the hazardous intersection of private passions and public loss.
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