Champion Boxer Dies Of Brain Injuries Days After Knockout

The boxing world is in mourning following the "devastating" death of Patrick Day at just 27.

The American was placed in a coma on Saturday after being knocked out in the 10th round of his super welterweight bout against Charles Conwell in Chicago.

Day faced a barrage of punches before he collapsed. He was immediately surrounded by medical professionals and, within minutes, was carried from the ring on a stretcher.

He never regained consciousness.

On Thursday morning, promoter Lou DiBella confirmed that Day had died of a traumatic brain injury, "surrounded by his family, close friends and members of his boxing team".

Patrick Day is taken out of the ring on a stretcher after being knocked out by Charles Conwell in the 10th round. Image: Dylan Buell/Getty

"On behalf of Patrick's family, team, and those closest to him, we are grateful for the prayers, expressions of support and outpouring of love for Pat that have been so obvious since his injury.

"Patrick Day didn't need to box.

"He came from a good family, he was smart, educated, had good values and had other avenues available to him to earn a living.

"He chose to box, knowing the inherent risks that every fighter faces when he or she walks into a boxing ring.

Charles Conwell (black trunks) and Patrick Day (red trunks) box during a USBA Super-Welterweight boxing match at Wintrust Arena. Image: AAP

"Boxing is what Pat loved to do. It's how he inspired people and it was something that made him feel alive."

Day turned professional in 2013 after taking out the New York Golden Gloves award the previous year and was a staple in the boxing community in New York City.

He won 17 of his 22 fights, with six knockouts.

Day's opponent, Conwell, 21, wrote a heart-wrenching letter in the days after the fatal fight, which he shared across Twitter and Instagram.

"I never meant for this to happen to you," he wrote.

"All I ever wanted to do was win. If I could take it all back I would no one deserves for this to happen to them.

"I replay the fight over and over in my head thinking what if this never happened and why did it happen to you.

"I can’t stop thinking about it myself I prayed for you so many times and shedded so many tears because I couldn’t even imagine how my family and friends would feel.

Patrick Day lands a punch on Charles Conwell in the third round of their Super-Welterweight at Wintrust Arena. Image: Dylan Buell/Getty

" I thought about quitting boxing but I know that’s not what you would want I know that you were a fighter at heart so I decided not to but to fight and win a world title because that’s what you wanted and that's what I want so I’ll use you as motivation every day and make sure I always leave it all in the ring every time," Conwell said.

READ MORE: Boxer Tragically Dies Shortly After Fight Was Stopped

Devastated boxers and fans have taken to social media to pay tribute to Day, who has been described as a "kind, happy and exceptionally good man who was outstandingly passionate about boxing".

It's the third boxing death this year. In July, Russia's Maxim Dadashev and Argentina's Hugo Santillan both died from injuries sustained in fights.