Three Dog, the Galaxy News Radio disc jockey and commentator, will not be returning in Fallout 4. The previous game had radio stations that you could access through your PipBoy, one of which featured Three Dog's voice as he provided updates about the player's actions in the wasteland.
Erik Todd Dellums, the voice actor for Three Dog, will not have his voice featured in the upcoming game. Though the actor appeared to tease his involvement with the game in a tweet made sometime in 2013. None of it was ever confirmed by Bethesda.
In the wake of news that voice acting for Fallout 4 had been completed, with over 110,000 recorded lines, the actor lamented that he would not be playing a role in the game.
Bethesda may have originally planned to include the character, but we'll probably never know if that was ever the case unless they say something about it.
Fallout 4 comes out on November 10 for the PC, Xbox One and PS4.