The Murder Mystery at the Detective Office

The private detective was recently found dead in his office, the whole case is very mysterious. The police have determined that he was murdered. They have secured and locked the crime scene, but will not do anything further - suspicious! You and your team have now arrived at the office and are the only ones who can solve the murder mystery. You now have 60 minutes to figure out who murdered the Detective in his office and manage to escape from this Escape Room before the police arrive to clear the office.