Former Florida high school football star Sam Bruce -- who was briefly part of the 2016 Miami Hurricanes team -- died due to a heart attack ... according to the medical examiner's report.
The Broward County Medical Examiner released the report, obtained by TMZ Sports, which revealed the cause of the issue was coronary artery disease.
Officials determined the manner of death was "natural."
As we reported, Bruce tragically passed away on April 28 after he suffered a medical episode while driving his car in Fort Lauderdale, Fla.
Bruce had become known nationally because of his play at powerhouse Florida H.S. St. Thomas Aquinas -- where he torched defenders so often, he earned the nickname "The Samborghini."
The do-it-all athlete eventually signed with the Hurricanes, but was dismissed for violations of team rules just months into his freshman season.
Bruce's death rocked the football world back in April -- with many current and former NFL players, including Chad Johnson, mourning the loss on social media.
Bruce was just 24 years old.
RIP.