Michael De Santa, one of the three protagonists in Grand Theft Auto V, is still alive after the events of the main story, it’s seemingly be confirmed (or re-confirmed) through the new GTA Online DLC.
In The Contract, Franklin is driving through a movie studio lot and says, “Man, sh**, I know one of the producers around here. I hope his ass ain’t at work today.”
This is believed to be a reference to Michael. Fans may recall that he became a film producer in GTA V, and this line of dialogue seems to confirm that Michael is still alive and still doing that job.