Maloney managed Lennox Lewis, who won the undisputed heavyweight championship of the world, between 1989 and 2001.

[9] By the late 1970s, her experience training other boxers and organising amateur competitions had led her to a career as a professional trainer, working with promoter Frank Warren.

[10] While best known as the promoter who took Lewis to the top, Maloney has also guided four other fighters to World Titles and has managed a string of British, European and Commonwealth Champions.

[11] On 14 September 2009 Maloney suffered a heart attack while watching John McDermott lose a contentious decision to Tyson Fury; significant heart damage was discovered when Maloney was admitted to hospital with shock after finding the body of client Darren Sutherland following his suicide.

[14] In April 2015, Maloney announced that, following the completion of her gender reassignment, she would be returning to boxing to promote again.

In 2014 she appeared in reality TV series Celebrity Big Brother,[16] reportedly receiving the highest fee of any housemate at £400,000.

[19] Maloney was the UKIP candidate for the 2004 London mayoral election,[20] during which she was accused of "Griffin-like racism".

[25] In a 2014 interview with LGBTQ magazine EQView, Maloney addressed her previous statements, stating: "I accept comments I made in the past were wrong.

[28] Maloney later left UKIP,[29] citing party leader Nigel Farage's stance on LGBTQ rights as the trigger for her withdrawing her support.

[31] In an interview with the Daily Mirror in 2015, Maloney disclosed that she once attempted to strangle her then-wife Tracey before her gender transition.

[35] Following threats from the press to out her,[9] in August 2014, Maloney announced in the Sunday Mirror that she is now known as Kellie, and was undergoing gender reassignment.