The chairman of Olympic Stadium operators the London Legacy Development Corporation has resigned amid the row over the escalating cost of converting the venue into a football ground.
David Edmonds has stepped down two days after London Mayor Sadiq Khan ordered a "detailed investigation" into the cost of West Ham's new home.
The outlay to modify the stadium has risen from £272m to £323m.
Edmonds was appointed chairman of the LLDC in September 2015.
He has been a board member of the Olympic Park Legacy Company and its successor, the LLDC, since 2010.