For some days I was visiting the hospital continuously to get info about Eva's accomplice. The one who could change the autopsy report was either a doctor (pathologist) or their helper. So my suspicion was three-person, a doctor who conducted Rit's autopsy and his two helpers.
Even if it was a celebration day the hospital was on duty but only a few remained. Entering, I found the doctor (pathologist) who I was searching for, on the second floor walking upstairs and followed him to the top floor.
As he was about to open his door I injected him with the teenager boy's (Riz) experiment, the truth serum he had created, and kicked on some of his vital parts of the body to stop his movement.
With his keys I opened his office, making sure there was no surveillance camera I dragged him inside and locked the door. I had avoided the camera outside the hospital and corridors.
No one could hear from outside. Sitting on a sofa I began the interrogation.