Stephen Paddock was overweight, had some anti-anxiety medication in his urine, and suffered from the usual wear and tear that comes with aging.

But the autopsy released Friday failed to help answer why Paddock chose to perch himself in the window of his 32nd-floor hotel room and kill 58 people while wounding hundreds in the worst mass shooting in modern American history. He committed suicide by shooting himself in the mouth. No suicide note or manifesto has been found…

The autopsy also included a short report from Stanford University, which studied his brain to determine whether there was anything unusual. It revealed what it called “the most striking abnormality” in the hippocampus, a part of the brain involving human learning and memory. The report did not say whether the abnormalities might have affected his behavior.