David Edmonds, the chairman of the company responsible for operating London's Olympic Stadium, has resigned from his position.
This comes after London Mayor Sadiq Khan ordered an investigation into why converting the venue into the home of Premier League football club West Ham United cost £50 million ($61 million/€55 million) more than initially expected.
Khan claimed the finances of the Stadium had been left in a "total and utter mess by the previous administration".
London Legacy Development Corporation (LLDC) chair Edmonds has not announced a specific reason for his departure.
But, in a statement released this morning, the LLDC said he had offered his resignation to the Board last night.
Edmonds, who was appointed chairman in September 2015, had originally joined the Board of the Olympic Park Legacy Company in 2010 and continued as a LLDC Board member since its inception in 2012.
He chaired the Investment Committee, as well as the Board of E20 LLP, a joint venture between the London Borough of Newham and the LLDC, responsible for the London Stadium.
Costs to convert the venue into a football ground were originally estimated at £272 million ($331 million/€300 million) by the administration of former London Mayor Boris Johnson in 2015.
It is thought the increases are partially explained by increased costs involved in installing 21,000 extra retractable seats installed to convert the stadium.
West Ham, who only pay £2.5 million ($3 million/€2.7 million) a year in rent, controversially contributed just £15 million ($18.4 million/€16.6 million) towards the overall conversion costs.
The rest was largely borne by the taxpayer and the LLDC.
"David has made an enormous contribution to the legacy of the London 2012 Games and he has helped to steer the organisation through some extremely challenging issues," said LLDC chief executive David Goldstone.
"We thank him for all his hard work and wish him well in the future."