An autopsy report says a 4-year-old boy who collapsed while playing soccer in suburban Houston had a genetic heart disorder.

The report by the Harris County Institute of Forensic Sciences obtained Thursday by The Associated Press says Cade Carpenter died of hypertrophic cardiopmyopathy. That is a genetic disorder that causes the heart, or parts of it, to become inflamed or enlarged, making it difficult for blood to flow.

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Carpenter collapsed at soccer practice on April 20. He was pronounced dead a few hours later at a hospital.

Paramedics performed CPR and used an automatic external defibrillator to try to restart his heart.