
The father-of-two was flown to Gold Coast University Hospital but died from his injuries overnight.
His wife, Colleen, said that Mr Cook's sudden death has "left a huge hole" in her heart.
"My beautiful husband Grant is now an angel watching over us" she wrote on Facebook.
"Life can be so cruel. He has left a huge hole in my heart and I know all family, especially his parents, are hurting trying to understand this tragedy."
Police are preparing a report for the coroner.
Mr Cook, from the Gold Coast, had been playing with the Murwillumbah Mustangs in a game against the Casino Cougars.
Northern Rivers Rugby League president Brian Rix told the Sydney Morning Herald that the incident had shocked the local rugby league community.
"It was just a normal game of rugby league that has turned into a tragic event," he said
"We are just a little bit taken aback this morning, trying to sort ourselves out."
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