The 58-year-old coach suffered a heart attack during the match in Tijuana, Mexico.
Sabrina Perez was facing Skye Nicholson and during the ninth round, Arua was knocked down while giving instructions.
Medics on the ground immediately rushed to him and he was taken to the hospital within minutes, but it was not enough to keep him alive.
Sabrina Perez's trainer & her husband Diego Arua has died of a heart attack after collapsing at the end of her defeat to Skye Nicolson in Mexico last night and coaching her wife until his last breath???????? #Boxing | #DiegoArua pic.twitter.com/XKnQamge0W— The Hood (@TheHood56524232) September 16, 2023
Diego Arua, the coach of Sabrina Perez, tragically suffered a fatal heart attack following her defeat to Skye Nicolson for the WBC interim title earlier today. Diego Arua passed away in hospital a short time later. RIP ???? pic.twitter.com/T2BkqV90 Yes— Kayovid (@Kayovids) September 16, 2023