Colón, who had 16 straight wins in his professional career, faced Terrel Williams in 2015 and was hit multiple times in the back of the head. Despite the then-23-year-old boxer complaining to the referee that Williams was throwing illegal punches to the back of the head and telling the doctor that he felt dizzy, the fight continued for nine rounds.
Colón collapsed after the fight and was taken to hospital, where he remained in a coma for 221 days. The boxer underwent brain surgery but remained in a vegetative state until his death on Thursday.
"It pains me to announce that my son has left this world, now he is in a better world," Colón's father Richard wrote on Facebook.
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