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The UK Anti-Doping Agency (UKAD) banned the boxer who died earlier this year for four years and later apologised for the error.
In a statement released on Monday afternoon, Ukad said Moises Calleros tested positive for cocaine in a post-fight drugs test following his loss to Britain's Galar Yafai last April.
The statement confirmed that Calleros would be banned from boxing for four years as a result, but it was revealed shortly afterwards that the Mexican had died in March, aged 34.
Initially, Ukad's statement read: “Anti-doping rule violation! Mexican professional boxer Moises Calleros has been suspended for four years for an anti-doping rule violation (ADRV) for the presence and use of the prohibited substance cocaine and its metabolites.”
After it became clear that Calleros had died three months ago, Ukad removed the statement from both its website and social media accounts.
They later apologised for the gaffe, saying: “The UK Anti-Doping Agency (Ukad) has today received information regarding the death of Mexican professional boxer Moises Calleros.”
“UKAD received this information shortly after publishing details of the outcome of the case regarding Mr Calleros, in accordance with UK Anti-Doping Rules.
“Unfortunately, UKAD had no information regarding Mr Cajeros' sad passing at the time of publishing and have now removed all details regarding this incident from their channels.”
The cause of Calleros' death is unknown, but his loss to Yafai on the undercard of the Anthony Joshua vs. Jermaine Franklin fight at the O2 Arena was the penultimate fight of his boxing career, his final bout being a first-round knockout win over Gerardo Verde Moreno in Ensenada, Mexico in December 2023.
Calleros compiled a record of 37 wins, 11 losses and 1 draw in a 16-year professional career that began in 2008 and challenged for the WBO minimumweight title in 2018, but was forced to retire in the eighth round against Ryuya Yamanaka in Kobe.
He also fought past or future world champions Julio Cesar Martinez, Jose Argumendo and Francisco Rodriguez during his career.
