Events of GTA IV
Julio does not appear in physical form at any point during GTA IV, but he is mentioned frequently in the in-game media such as on websites and also during some missions and in the Higgins Helitours. The closest he came to an appearance was in The Lost and Damned, while Thomas Stubbs III receives a call on his cellphone from Johnny Klebitz, while Stubbs is in a meeting with the mayor. Jon Gravelli claims he was going to receive a visit from him in the hospital, he also claimed that he was going to receive a visit from two US Senators.
It has been mentioned on the radio that Ochoa began a campaign to make the sale and possession of firearms illegal, and he also launched cases against Ammu-Nation stores across the country; These regulations, however, have proved to be massively ineffective to prevent crime.
During a Helitour, the pilot mentions to Niko and the other tourists that Ochoa eased safety restrictions on helicopters and their pilots. Julio Ochoa also settled the Diamonds case when he allowed Jerry Kapowitz to keep all proceeds on the sale of the diamonds after he found them, despite over a hundred claims of their ownership. The reason given was that it would be impossible to verify the claims. It would make him extremely unpopular with a number of people in the Liberty City underworld.
Events of GTA Chinatown Wars
It's possible that Julio Ochoa is based on Fernando "Freedy" Ferrer, a Democratic Party nominee for New York mayor in 2005.