High School football player collapses, dies during practice

NEW YORK (WABC) -- The cause of death of a 16-year-old high school football player in New York City who collapsed during practice has been determined, officials said.

Miles Kirkland-Thomas died of hypertrophic cardiomyopathy, and his obesity was a contributing factor. Hypertrophic cardiomyopathy causes the heart muscle to thicken, which makes it harder for the heart to pump blood, according to the Mayo Clinic website.

The teen's father says collapsed Sept. 1 during practice for Staten Island's Curtis High School. He was pronounced dead at a hospital.

Jamar Thomas reportedly said that his 6-foot-2, 320-pound son had passed a physical in July and the family was not aware of any pre-existing conditions.

Schools Chancellor Carmen Farina released a statement saying at the time, "I am deeply saddened to learn of this tragic loss and my heart goes out to the family. We will be supporting the school community as we investigate the matter."

Counselors and support will be available for students and school staff.

(Some information from the Associated Press)