SAN FRANCISCO (Canadian Press) -- Officials say a 46-year-old Texas man died in the frigid waters of the San Francisco Bay just moments after the start of the Escape From Alcatraz Triathlon.

Race officials said in a statement that they have reason to believe the man from Austin died of a massive heart attack in Sunday's race, which was held months earlier than previous years and in far colder waters.

The statement says the death is the first in the 33-year history of the event, which begins with a 1.5-mile swim from the site of the former federal prison followed by an 18-mile bike ride and an 8-mile run through San Francisco.

The unidentified man was pulled from the water and CPR was performed, but he could not be revived.

The Canadian Press, 2013