Back in May, Overkill Games announced that it was developing some sort of collaborative Left 4 Dead-PAYDAY crossover project, together with Valve.

One month later, a teaser trailer for this crossover project was released, revealing it to be a DLC heist level for Overkill Games’ PAYDAY: The Heist. The teaser trailer depicted action-packed gunfights with police units, set in L4D1’s infamous Mercy Hospital, prior to the zombie apocalypse that turned the world of Left 4 Dead upside down.

But since then, no further details on this DLC have been released. Well… until now!