American boxer Patrick Day passes away aged 27: Details here

Describing the incident, Conwell was dominating Day throughout.

However, it was in the 10th round when he landed a right hand on him, which made Day stumble.

Conwell followed it up with a huge left hook as Day landed on his back, while his head bounced off the canvas, resulting in referee Celestino Ruiz calling the bout off in a minute and 46 seconds.

Boxing promoter Lou DiBella confirmed the unfortunate demise of Day in an official statement, hailing the Day's kindness, positivity, and generosity of spirit'.

"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," wrote DiBella.

Meanwhile, Conwell too expressed his grieve for the incident, as he said that he never meant for this to happen and would take it all back if it was possible.

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

"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," wrote Conwell.

Meanwhile, following Conwell's emotional statement on Day's demise, DiBella was moved to tears as he wants the former to realize that it was not his fault.

"I read what he wrote and it put a tear in my eye. It was an incredibly human and honest and genuine response from a kid who is just 21," he said.