Witter's first fight as a professional took place in January 1997 and scored a draw over Cameron Raeside at the Green Bank Leisure Centre in Derbyshire.
A first defence of his Commonwealth title took place in September at the MEN Arena in Manchester with a win in the 2nd round giving victory over Kenyan Fred Kinuthia.
The year ended for Witter with a first defence of his European crown at the Conference Center in Wembley beating Polish fighter Krzyztof Bienias.
In July of the same year Witter returned to the Ice Arena in Nottingham to score a win over Ukrainian Andriy Kotelnik in a close fought fight which was also a defence of his European title.
[4] Witter finished the year with a win over fellow Brit Colin Lynes in a fight which saw his British, Commonwealth and European titles all on the line at the same time.
September 2006 finally saw Witter win a world title when he challenged American Demarcus Corley for the vacant WBC light welterweight belt at the Alexandra Palace in Wood Green.
Two defences of the title followed in 2007 with wins over Mexican Arturo Morua (TKO 9) and Guyanese Vivian Harris (KO 7) before on 10 May 2008, losing the belt to mandatory challenger Timothy Bradley via split decision.
Following his loss to Bradley, Witter declared he would continue fighting at a professional level and vowed to return to the ring to reclaim his WBC crown.
[8] The fight, this time in Ontario, Canada, resulted in another loss for Witter as he was beaten over 10 rounds by Romanian boxer Victor Puiu for the WBC International silver welterweight title.
[9] On 7 June 2011, Witter entered the welterweight version of the Prizefighter tournament at the York Hall in London and defeated Nathan Graham and Kevin McIntyre on the way to the final.