A boxer from London has tragically died after collapsing in the ring during the fourth round of his professional debut on Sunday. Middleweight boxer Sherif Lawal, 29, was fighting the first bout of his pro fighting career at the Harrow Leisure Centre northwest of London Sunday night when he collapsed in the ring, according to Warren Boxing Management, which promoted the match. “Last night, Sherif Lawal was making his debut at a show at Harrow Leisure Centre, in which our boxer Courtney Bennett was scheduled to fight,” Warren Boxing Management said in a statement Monday. “Unfortunately during S…