DOUGLASVILLE, Ga. – A Douglas County High School football player was removed from life support Monday after he collapsed after practice the Tuesday prior.

Zyrees Oliver, a 17-year-old honor student and team captain, was rushed to the hospital shortly after he collapsed in his home late last Tuesday following football practice.  Family members removed a ventilator Monday after losing hope for Oliver’s recovery, but an official cause of death has not yet been determined, The Atlanta Journal Constitution reports.

“Zyrees had medical issues in recent months, including cramping, dehydration and migraines, according to his family. While it is not yet known what caused him to collapse, his loved ones said they suspect Zyrees over-hydrated after practice, drinking two gallons of water and two gallons of Gatorade,” the news site reports.

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“It’s incomprehensible,” Nina Oliver, the young man’s aunt, told the AJC. “We had a healthy, beautiful, vibrant young man.”

Doctors told Oliver’s family the football standout suffered massive swelling around his brain, and that an autopsy will be conducted to determine why exactly he died. Oliver, originally from New Jersey, moved to Georgia with Nina Oliver, her younger sister, and his brothers about a year ago “for a fresh start,” according to the new site.

The teen was apparently a well like, humble, hard-working young man with an ambition to play college football. He was a leader both on the football field and in the classroom, and had earned a 3.8 GPA, his friends and family told the AJC.

“He was one of the leaders on the team,” sophomore teammate Joshua Sams said. “He made sure we were doing what we were supposed to be doing and not slacking.”

“He was absolutely a born leader,” Nina Oliver said. “Zyrees was just was the type of person that would do anything in the world for you. He was just the most respectful kid you ever wanted to meet.”

School principal Tim Scott informed students of Zyrees’ death on Monday and issued a prepared statement to the media.

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“Zyrees was part of the Tiger Family since the end of his sophomore year, but during that short time he touched many lives,” Scott wrote. “Zyrees was a blessing to his football and track teammates, his classmates, coaches and our school staff.”

Zyrees’ family is working to raise money through a GoFundMe website to pay to return him to New Jersey to be buried.