The St. Petersburg-born light-welterweight collapsed while making his way out of the ring moments after his trainer Buddy McGirt threw in the towel to save his fighter from further punishment on Friday.

Dadashev, who was based in Oxnard, California, throughout his profesisonal career, later went to hospital where he was operated upon to relieve swelling to the right side of his brain, where he had suffered a bleed.

He was said to be showing signs of "severe brain damage" but no further information was released until his wife reached the USA from Russia. On Tuesday it was reported Dadashev had died of his injuries.

Many boxing figures gave impassioned speeches about the incident, including former two-weight world champion Timothy Bradley, famed trainer Teddy Atlas and Dadashev's own trainer McGirt, himself a former light-welterweight world titlist.