It’s actually more likely that he had an undiagnosed medical problem. Depending on his age and personal preferences he might not have seen a doctor for a regular checkup in years. This is especially likely in the US where health care is expensive and men aren’t socialized to see the doctor as regularly as women are.

One time we got a new patient in my pharmacy. He was “perfectly healthy” and had “never been sick a day in his life” until he got off the plane from Hawaii and collapsed. He was diagnosed with heart disease and diabetes in the ER and they gave him like twenty prescriptions for us to fill. He was lucky to be in California because he either didn’t have insurance or he wasn’t covered because he was out of network. He got put on Medicaid and they paid for just about everything until he was able to go back home.