You've been working as a detective agent for quite a while now, and the current case was nothing new. First, one victim, apparently hit with a baseball bat and his face desfigurated with an object the forensics were unable to determine, probably a rock. Then two victims with the same pattern, and suddenly... a member of the investigation unit you were the chief from and a close friend of yours was found dead. The same pattern... the same murderer. After that, your unit was disassembled, and you were sent to another one to investigate a different case.

It's been a while now. A year, exactly, and you've been told that the number of murders increased in that period of time to 8 victims, which may not look as a lot, but considering the killer's method... Anyways, one day, a coworker suddenly appeared at your office, and told you that the culprit of the old case you leaded was found, and the chief wanted you to do the first interrogation, as he knew that you managed to be "somewhat close" to the murderer during the investigation. Confused, you go to the interrogation room and...

It's him.