William Fenton, of Ayrshire, drugged and sexually assaulted women A rapist drugged four women before carrying out sex attacks on them. William Fenton was jailed for life on Wednesday after he was convicted of sex attacks on the four women. The 55-year-old was previously jailed for rape, indecent assault and drugs offences in Northern Ireland, before he was released and resettled in Ayrshire. Fenton drugged his victims by lacing drinks with a substance that caused them to pass out, before he abused them. He raped one of the women after he had drugged her, while one of his other victims was filmed being abused by Fenton on his mobile phone whole she was unconscious. The sex attacker, known as Billy or Irish Billy, sexually assaulted another woman while his fourth victim told his trial of how she awoke to find Fenton rubbing baby oil on her. Previously, Fenton had been jailed for 12 years in 2000 after being convicted of rape in Belfast. Lord Burns told him at the High Court in Edinburgh: "You were convicted in May of this year of the rape of one complainer and the sexual assaults of three others having given them some substance which rendered them unconscious." The judge said the offences were serious and bore similarities to previous convictions. Lord Burns added: "In particular, I note you have been convicted in the past of the sexual assault of young girls and of women. In 2000 you were convicted of rape and later that year indecent assault on a female after administering some stupefying substance upon her. The risk you present to the public is a high one and you are really a clear danger to females. Fenton was given a lifelong restriction order and told he must serve a minimum of six years in prison before he can seek parole. Defence solicitor advocate Edward Gilroy told the judge: "He continues to maintain he has been wrongly convicted."He added that given the type of offending, his previous convictions and the contents of a risk assessment report that Fenton was "realistic" about the outcome of the proceedings. Following an earlier trial, Fenton was found guilty of drugging four women in Ayr between June 2011 and April last year before committing the sex attacks.