Frankie Fredericks was forced to down from two key administrative roles after corruption claims. The four-time Olympic silver medallist denies any corruption.
Fredericks decision comes after French paper Le Monde claimed the former Namibia sprinter received a payment days before voting on the 2016 Olympics host city, allegations he denies.
Following the claim by French paper Le Monde, the International Olympic Committee (IOC) is now investigating the claims.
The IAAF council member and four-time Olympic silver medallist has quit as head of the evaluation commission for the 2024 Games, having already left a taskforce helping Russia return to international competition.
As head of the IOC evaluation commission, Fredericks was to lead an inspection visit to 2024 candidate cities Los Angeles and Paris.
In a statement, the 49-year-old said he was stepping down from his IAAF role, so as not to be a distraction, adding: “It is important that the taskforce’s mission is seen as free and fair with no outside influence.”
The IAAF says Fredericks’ place on the five-person taskforce has been taken by IAAF Athletes’ Commission chairperson Rozle Prezelj.
Following the McLaren report, Russia’s athletes were banned following the outlined a state-sponsored doping programme.