William Irwin (born May 20, 1968, Niagara Falls, Ontario, nicknamed "Billy the Kid", is a retired Canadian amateur lightweight and professional light/light welter/welterweight boxer of the 1990s and 2000s who as an amateur won a bronze medal in the Boxing at the 1991 Pan American Games in Havana, Cuba, losing to eventual silver medal winner Patrice Brooks of the United States, represented Canada at the 1991 World Amateur Boxing Championships in Sydney, Australia losing to Julien Lorcy of France. He represented Canada at the 1992 Summer Olympics in Barcelona but was stopped in the second round of the lightweight division (– 60 kg) by Ronald Chavez of the Philippines.
As a professional, he won the Canadian Professional Boxing Council,Canadian Professional Boxing Council website. Accessed November 23, 2022. lightweight title, Canada lightweight title, International Boxing Organization (IBO) lightweight title, World Boxing Council (WBC) Continental Americas lightweight title, and Commonwealth lightweight title, and was a challenger for the International Boxing Federation (IBF) lightweight title against Paul Spadafora, and World Boxing Association (WBA) World lightweight title against Juan Díaz, his professional fighting weight varied from , i.e. lightweight to , i.e. welterweight.
Irwin's last stand was in 2005, against the undefeated World Champion Juan Diaz. After losing to Diaz, Irwin walked away in class retiring from a respectable pro boxing career that spanned over 12 years. He was a four time Canadian National Champion, a Bronze Medalist at the Pan-American Games, with an amateur record of 130-20-0 and a professional boxing record of 44 (31)–5-0.
He now trains amateurs, upcoming international fighters and professional boxers in Niagara Falls, Ontario. One of his fighters won the 2012 Canadian Champion Best Youth Boxer Award.
Professional boxing record
ResultRecordOpponentTypeRound, timeDateLocationNotes48Loss42–6Juan DíazTKO9 (12), Jan 21, 200547Win42–5Lou BizzarroTKO9 (10), Jul 28, 200446Win41–5Mark RiggsKO1 (10), Jul 5, 200345Win40–5Luis Gustavo SosaTKO4 (10), Apr 26, 200344Win39–5Richard HowardTKO2 (10)Jan 17, 200343Win38–5Vincent HowardTKO9 (10), Oct 28, 200242Win37–5Mario LechowskiTKO7 (12), Sep 14, 200241Win36–5Chad BrissonMD10Apr 10, 200240Win35–5Teddy WorthUD6Jan 31, 200239Loss34–5Dorin SpiveyUD10Jun 15, 200138Loss34–4Paul SpadaforaUD12Dec 16, 200037Win34–3Moisés PedrozaTKO1 (10), Sep 23, 200036Win33–3Miguel ArrozalTKO6 (10)Jun 2, 200035Win32–3Rubén Darío OlivaKO2 (10), Apr 26, 200034Win31–3John BaileyTKO7 (10), Mar 24, 200033Win30–3José Vida RamosTKO4 (8), Dec 10, 199932Win29–3Larry O'ShieldsTKO6Sep 24, 199431Win28–3Damion StuttonTKO3 (8)Aug 12, 199930Win27–3Shawn SimmonsTKO2 (10), Jul 20, 199929Win26–3John LarkKO2 (10)Jun 4, 199928Win25–3David ArmstrongTKO2 (10), Mar 19, 199927Win24–3Charles TschorniawskyTKO8 (10)Dec 11, 199826Loss23–3Gerald GraySD8Oct 2, 199825Loss23–2Ahmed SantosUD10May 12, 199824Win23–1Andy WongUD10Apr 22, 199823Win22–1José ManjarrezUD10Sep 15, 199722Win21–1Andre CraySD10May 13, 199721Loss20–1David TettehUD12Mar 4, 199720Win20–0David TettehMD12Oct 11, 199619Win19–0Daniel SarmientoKO3 (10), Aug 29, 199618Win18–0Manuel Alberto BillalbaKO8 (10)Mar 30, 199617Win17–0Juan Luis SánchezUD10Jan 25, 199616Win16–0Jesús RodríguezMD12Sep 28, 199515Win15–0Amado CabatoUD12Jun 8, 199514Win14–0Rodney WilsonKO6 (10)Apr 28, 199513Win13–0Bobby JohnsonKO1 (10), Feb 24, 199512Win12–0Alex PérezKO1 (10), Jan 11, 199511Win11–0Stan CunninghamTKO4 (10)Dec 9, 199410Win10–0Steve ThomasKO1 (10), Oct 27, 19949Win9–0Manuel SantiagoUD8Aug 11, 19948Win8–0Nedrick SimmonsTKO8 (12), Jun 8, 19947Win7–0Charles BealsKO2 (10), Apr 13, 19946Win6–0Dezi FordUD6Dec 9, 19935Win5–0Brent MitchellTKO2 (6), Oct 2, 19934Win4–0Ben SimmonsTKO5 (6), Jun 12, 19933Win3–0Clifford HicksUD6Apr 14, 19932Win2–0John GottschlingKO1 (6), Mar 26, 19931Win1–0Charles McClellanTKO1 (6), Feb 11, 1993
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