The question that sent Roberta Williams into a violent rage and caused her to choke a reporter against a hotel wall has been revealed. The widow of notorious slain gangster Carl Williams was being interviewed by A Current Affair when she flew into a fit of rage. Mrs Williams allegedly grabbed reporter Reid Butler by the neck and slammed him into a wall during the feisty television interview. The full interview, which aired on Monday night, showed how a comment by Butler about how her husband 'committed four atrocious murders' set Ms Williams off. The interview started well with Mrs Williams and journalist Reid Butler exchanging pleasantries. But their discussion of how informant Lawyer X may have allegedly landed her Melbourne gangster husband in jail soon turned sour when Butler made the remark. 'Informant X was a very small part of this. Carl Williams committed four atrocious murders,' the reporter said. 'He ordered hits on four people.' But before he could say anything more, Ms Williams angrily looked out of shot, saying: 'we're not getting into this sorry, this wasn't part of this'. Butler tried to justify his line of questioning as she stormed out of the door, prompting her to warn 'you're going to get me really angry'. The probing question that sent slain gangland widow Roberta Williams (pictured) into a rage and caused her to violently snap and hit a reporter has been revealed With a crowd of people surrounding them, she also lashed out at Butler with her hand - saying 'seven f***ing questions' The confrontation then took a violent turn as the reporter followed her in an attempt to explain himself. Ms Williams also threw camera equipment onto the floor during the chaotic scenes, and could be seen grappling with the reporter in the hallway. With a crowd of people surrounding them, she allegedly grabbed Butler by the neck with her hand, saying 'seven f***ing questions you gave me.' Butler said he felt shaken and was left bleeding after his encounter with Mrs Williams. 'She's ... tried to wrestle documents out of my hand in the corridor, and there's a bizarre tussle between us. She's scratched my hand in that process and I was bleeding,' Butler told news.com.au. 'Throughout all of this she was screaming threats and calling me a dog, and saying she was going to kill my family and cave our heads in, which was bloody confronting.' Their discussion of how informant lawyer X may have allegedly landed her Melbourne gangster husband in jail turned sour when Butler (pictured) remarked that Carl Williams 'committed four atrocious murders' Ms Williams also threw camera equipment onto the floor (pictured) during the chaotic scenes, and could be seen grappling with the reporter in the hallway Butler said Ms Williams lunged towards him and grabbed his neck, throwing his head towards the wall after he asked her a touchy question. 'I wasn't expecting it. The crew wasn't expecting it. It enraged her,' Butler said. The journalist said he would not be seeking charges against Mrs Williams, who was 'really stressed'. 'I know it was a mistake by Roberta. Like I said, not in a great state of mind right now and is feeling highly stressed and emotional,' Butler said. The interview comes as a Royal Commission into the police use of gangsters' lawyers as informers gets under way. The convictions of several gangsters could reportedly be overturned because their defence barrister was a police informer known as Informer 3838, meaning their trials were not fair. Carl Williams kisses his daughter Dhakota after being granted bail in December 2003, as his wife watches on in the left of the picture smiling The lawyer worked for Williams and others but led a double life as a police informer from 1996 to 2009. Speaking about the female lawyer, Mrs Willams said: 'She was like one of the boys. 'She was playing two sides of the fence, so of course it was a front. 'She came into this to put Carl in prison for the rest of his life.' Mrs Williams said if her husband were still alive his conviction would be overturned and he would be set free. Williams was murdered in April 2010 by a fellow inmate in a secure unit of Barwon Prison after he agreed to rat against fellow criminals in exchange for extraordinary concessions from Victorian authorities. In chilling prison CCTV footage, Williams is seen reading the newspaper with his killer standing behind him with the exercise bike saddle that would be used to bludgeon him to death.All rights reserved for this news site dailymail and under his responsibility