English Dave appears and adds more background on El Rubio's penchant for extravagant dance parties on his private island. The player is directed to meet with Miguel Madrazo in The Music Locker underground nightclub at The Diamond Casino & Resort, where he provides some background on Juan Strickler and his dealings with the Madrazo Cartel. The update was eventually released on December 15th.

One day later, on December 10th Rockstar released another newswire post, which stated that the Cayo Perico Heist DLC was the biggest musical update since launch, and that it will include three new radio stations ( Still Slipping Los Santos, Kult FM 99.1 and Music Locker Radio), and new remixes for two existing stations ( FlyLo FM and WorldWide FM). After four days, on December 9th Rockstar released an additional newswire post alongside a new trailer. On December 5th, Rockstar announced through the Newswire the future opening of a new venue located under The Diamond Casino and Resort: The Music Locker.

The next day, Rockstar released a teaser trailer on the Newswire along with the official title of the upcoming DLC and various information about its content. The next week, on November 19th, a teaser was uploaded on the Rockstar Games twitter account and a dead, mutilated body with a briefcase appeared at random locations along the shoreline of Vespucci Beach. The first hint of this DLC came on the November 12th as a mysterious text message from Tom Connors and the addition of construction props by a service door on the north side of The Diamond Casino & Resort.

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