true-crime series Vincent Vermignon joins the cast of HBO Max’s true-crime series ‘The Staircase’ 3 years ago Vincent Vermignon has joined the cast of The Staircase, HBO Max's restricted series drama adaptation dependent on Jean-Xavier de Lestrade's… Olivia DeJonge joins the cast of HBO Max’s true-crime series ‘The Staircase’ 3 years ago Olivia DeJonge (The Society) has joined the cast of The Staircase, HBO Max's limited series drama adaptation dependent on the…