Olanrewaju lost consciousness while facing Ghanaian boxer Jon Mbanugu at Fight Night 15 of the Ghana Professional Boxing League at Bukom Boxing Arena.
Reports show that he was ahead on points before the unfortunate incident occurred.
A widely circulated video on social media captures the moment he collapsed in the ring, further shocking fans and the boxing community.
Olanrewaju, a respected Nigerian boxing figure, had previously held National and West African light-heavyweight titles.
His contributions to the sport have been widely recognized as colleagues, fans, and sports officials have been paying tribute to his legacy.