Morgan Merryweather was first depicted as host of Double Clef FM in Grand Theft Auto III, a stereotype of a pompous classical music afficionado, interspersing the tracks with references to his refined lifestyle. His cultural references, however, are often incorrect. For instance, he at one point likens a piece of music to "Fellini's Lolita." Lolita was written by Vladimir Nabokov, and adapted for film once by Stanley Kubrick and again by Adrian Lyne. Federico Fellini never turned the book into a film. Moreover, Merryweather notes that he spent a summer "reading Proust in the original Italian." Marcel Proust wrote in French, not Italian. For the Liberty Tree newspaper, he writes the Opera with Morgan Merryweather article in July 2001 and the Bayreuth Be Damned article in August 2001.
In 1986, the setting of Grand Theft Auto: Vice City, he phones in to K-CHAT during Claude Maginot's interview, discussing Maginot's performance in the play In the Future, There Will Be Robots. In 1998, the setting of Grand Theft Auto: Liberty City Stories, he phones into Double Clef FM to complain about the program's present quality and host Sergio Boccino. Strangely, Morgan complains of the amount of music Sergio plays from Italian composers; by 2001, Morgan had replaced Boccino, yet Morgan plays the exact same amount of Italian music when he replaces Sergio in GTA III.
He is voiced in all three appearances by Gerry Cosgrove.