There is an old proverb which says: "As a dog returns to its vomit, so a fool repeats his folly." Tammy Kingdon's folly was to return to Troy Mercanti on more than a dozen occasions during their tumultuous 16-year relationship. The final result was that she became, at least as far as the underworld is concerned, a dog - the derogatory term reserved for anyone who gives information to police. It was the prolonged brutality of Mr Mercanti's alleged attack on January 6 which turned the unerringly loyal Ms Kingdon against him. Her lawyers told the Perth District Court last year, after Ms Kingdon was convicted of stealing, that she was a victim of regular physical abuse and had once had her teeth knocked out and an eye socket broken. But she stayed with him anyway. This time it was different. She wasn't beaten because of a drunken quip or because of an argument. Police sources say Mr Mercanti believed Ms Kingdon had been cheating on him with another man. She was allegedly beaten mercilessly and degraded. Mr Mercanti went to Queensland to meet fellow Finks bikies after the incident, while Ms Kingdon stewed about it. Last Friday, she took the two boys she bore to Mr Mercanti and disappeared into police protection. When Mr Mercanti discovered Ms Kingdon and the children were missing, he went on a massive bender which ended when he was arrested on Sunday morning while trying to smash through the sliding glass door of a Duncraig home. He is in custody at Sir Charles Gairdner Hospital, under armed guard, and requires dialysis after his kidneys shut down. In the long-term, he needs a kidney transplant. But the next move is Ms Kingdon's. She has given police a statement in which she alleges Mr Mercanti bashed her three times in five years, including the attack on January 6. Will she continue with the claim or will she return to him as she has so many times before? The ramifications of her decision are dire. Bikies don't appreciate those who testify against them. And they rarely forgive and forget. Making matters worse for Ms Kingdon is that she has no visible means of support. Her assets consist of two properties - in Jurien Bay and Balga. Both are heavily mortgaged and the Balga property is the headquarters of the Finks. It's difficult to see them paying the rent while she is having their WA leader prosecuted. Just why Ms Kingdon continually returned to an allegedly abusive partner is something that a psychiatrist examined last year as part of the sentencing process after she was convicted of stealing. Dr Sam Febbo's report has been kept private, but the details of Ms Kingdon's life were revealed by her lawyer Stephen Shirrefs in court. Born on July 16, 1976, Tammy Cherie Kingdon grew up in Denmark, but her parents Norman and Faye separated when she was five. Ms Kingdon went to live with her father on a farm about 20km out of town and the District Court was told she was beaten and tormented by her stepmother. She had panic attacks at school because she feared going home. Ms Kingdon finished her schooling to Year 10 in Denmark before completing Year 11 at Albany. She then left to live on the Abrolhos Islands, near Geraldton, where she had a two-year relationship with a crayfisherman. When the relationship ended, Ms Kingdon, aged 18, moved to Perth and worked at the Wanneroo Tavern before moving to Kalgoorlie. There she met Mr Mercanti, then a nominee of the Coffin Cheaters bikie gang. They have been on-and-off ever since she was 19 and now have two children, aged 11 and 10. For a time, Ms Kingdon worked as a stripper, but these days she rarely works. Though she had said during last year's court case that she was leaving him and moving down south to be with family, she did not leave and has since travelled to the Gold Coast and Adelaide to be with Mr Mercanti. Few believe she could now return to Mr Mercanti after making the complaint to police. One said: "He's not the type to let sleeping dogs lie."