The report said Mark Austry died of myocarditis, an inflammation of a heart wall that is caused by a viral infection.
Austry collapsed and died after finishing a 13.1-mile run benefiting the Susan G. Komen Breast Cancer Foundation.
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"We high-fived, (and) he got a glass of water,” Michael Austry, Mark's brother said during an interview last month, “I turned around and just missed catching him; he was out.”
Mark Austry is survived by his wife and two daughters, ages 1 and 3.