Dead Air.

A black comedic murder mystery that revolves around a failing shock jock at a radio station whose ratings improve as his staff and co-workers are murdered. A mysterious caller takes credit for the murders and threatens to kill the DJ, Jack Auphil and his news anchor, Amanda Quaker. The police suspect Auphil yet can't establish the evidence to arrest him engaging him in a brutal game of cat and mouse as the bodies stack up and suspects mount.