NEW YORK — Authorities say a 32-year-old man who died during the New York City Triathlon last summer was killed by a condition linked to high blood pressure.

Esteban Neira died in the Hudson River during the swim portion of the triathlon on July 20.

The cause was initially a mystery. But after further testing, the medical examiner ruled the cause of death was hypertensive cardiovascular disease.

Triathlon organizer John Korff says the Argentine athlete apparently was unaware he had the condition.

Hypertensive heart disease is a common killer. But its symptoms often don't appear until someone is dangerously ill.

Korff says athletes should get physicals before committing to the rigors of triathlons.