However, Deley has struggled in the live role and attracted complaints for his stilted delivery, frequent mistakes and problems pronouncing the names of fellow presenters. At one stage he told viewers they would see "history in the making as Oscar Pistorius from South Africa makes history".
A video of his presenting gaffes, titled 'Ortis Deley presenting masterclass', was posted on YouTube and drew a string of angry comments. One complainant said: "The bosses at Channel 4 have to take all the blame for this embarrassment. This is a very big event for them and they should've made sure they hired a half-decent presenter who could handle live TV."
Watch the Ortis Deley YouTube video:
Channel 4 said that the number of complaints it has received was in the "low hundreds" since the events began on August 27, while some of the objections were about the advertising interruptions in the coverage compared with the commercial-free BBC.
Deley will remain with Channel 4's presenting team in Daegu, South Korea, but his role has been "scaled back" to no longer involve being the main presenter.
He has been replaced by Rick Edwards, who also has no previous live athletics experience, but has presented Channel 4's Paralympics preview programme That Paralympic Show.