Fiona Woolf has resigned her position as chair of the historical Westminster child sex abuse inquiry in a letter to the Home Secretary following mounting pressure from alleged victims.
Despite support for Mrs Woolf today from the Prime Minister, campaigners said the entire process would be "a dead duck in the water" if she was allowed to remain in the role.
Concerns had been raised over the links between Mrs Woolf, a corporate lawyer and the current Lord Mayor of London, and Lord Brittan, whose decision making as the then-home secretary is expected to be examined in the inquiry into alleged abuse in the 1980s.
Documents published last night showed a letter outlining Mrs Woolf's contacts with Lord Brittan and his wife was redrafted seven times, with guidance from Home Office officials, before being sent to Home Secretary Theresa May.
It led to Mrs Woolf being called to face MPs again next week to answer further questions about her suitability to lead the inquiry before she announced she would stand down.
She becomes the second person to voluntarily quit the role following public concerns about her links to establishment figures after initial chair Baroness Butler-Sloss resigned in mid-July, a week after the Home Secretary announced the independent inquiry.
As Fiona Woolf becomes the second person to quit as head of the Westminster sex abuse probe, here is what you need to know about it so far.
The chair of an inquiry into an alleged historical Westminster paedophile ring has been accused of 'editing' details of her impartiality.