From this page of the Disco Elysium game guide, you will find out if the main character Harrier Du Bois can die.
Disco Elysium is a highly original isometric view RPG with an emphasis on the narrative aspect. The action of the game takes place in Revachol, and the main character of this production is a detective Harrier Du Bois, trying to solve a difficult case of lynching committed on a stranger. Game Disco Elysium does not shy away from making difficult decisions that can have dire consequences.
In Disco Elysium, the main character can die in many different ways - even during the first few minutes of gameplay! You need to keep this in mind, especially when attempting to perform some dangerous activity. When a character dies, the screen will display a specific article from the local newspaper, an original headline.