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This article (or section) refers to content in the Enhanced version for the PlayStation 4, Xbox One and PC release of Grand Theft Auto Online that may be absent from other versions.
For a complete list of the features of the Enhanced version for the PlayStation 4, Xbox One and PC version of Grand Theft Auto Online, please see here.

Thornton: "May I come in? I come in peace!"
Ms. Baker: "You've got some nerve."
Thornton: "I come in peace."
—Thornton Duggan and Agatha Baker.

Thornton Duggan is a character in Grand Theft Auto Online, introduced in The Diamond Casino & Resort update as a main character. He is also the unseen main antagonist of The Diamond Casino Heist update.



Thornton Duggan is the nephew of the former head of the Duggan Crime Family and infamous industrialist Avery Duggan. He is less dangerous than him, and betrays him to buy the Diamond Casino, becoming the new owner. He is also the older brother of the late Los Santos oil baron, Mason Duggan.

Events of Grand Theft Auto Online

The Diamond Casino & Resort

Thornton: "Maybe I can help your uncle and you leave a little more dignity and more. I will offer asking plus twenty percent and a quick sale and a good relationship, but you gotta help me."
Ms. Baker: "Help?"
Thornton: "Kill my uncle."
—Thornton Duggan and Agatha Baker

Thornton is first encountered during the mission Casino - Strong Arm Tactics, when the protagonists, Tao Cheng, his translator, and Agatha Baker have a meeting with Avery and Thornton.

The meeting goes sour, as Tao pulls a gun and threatens Avery following a racial remark, and Avery, seeing they will never sell the casino, orders his men to eliminate them.

Thornton later appears in the mission Casino - Bad Beat to tell everyone he still wants the casino, and that he and his uncle had a falling out. In an attempt to gain their trust and butter them up, he warns them of an incoming attack of The Professionals, hired by Avery to destroy the casino.

In the final mission, Casino - Cashing Out, as Tao Cheng and his Translator are about to leave for China due to his uncle telling them to immediately sell the casino, Thornton returns and informs them of a plan to save the casino, but mentions he won't have the money to do so unless they kill his uncle, thus giving Thornton both his inheritance and full control of the Duggan Crime Family.

Avery Duggan is killed and Thornton celebrates his death with the rest of the casino crew but not before dismissing Vincent, and later becoming the new owner.

The Diamond Casino Heist

Brucie: "Can you get your boss online? Mr. D, where is he?"
Debbie: "Mr. Duggan?"
Brucie: "Yeah!"
Brucie Kibbutz and Debbie during Casino Heist - The Big Con (Yung Ancestor disguise)

In December 2019, Cheng Family Holdings vice president Georgina Cheng arrives in Los Santos and utilizes her hacking skills to arrange a meeting between Lester Crest and the GTA Online Protagonist in Mirror Park. As soon as Lester realizes that he's been set up, Georgina appears and introduces herself. She requests that Lester come out of his retirement and work alongside the protagonist to help her plan an elaborate heist on the Diamond Casino & Resort to take revenge on Thornton Duggan.

After careful planning, the casino is robbed multiple times, humiliating Thornton and costing him millions due to his insurance premiums.


Despite being less dangerous and saving the casino, he is actually a sociopathic and cocky individual, going as far as killing his own uncle and celebrating it after, showing no remorse or regret for doing so.

Mission Appearances

Grand Theft Auto Online

The Diamond Casino & Resort