Who's The Murderer?

In the year 189, when the crime started. The person- the murderer seems like to enjoy killing random people. He killed over 100 people in the small town... leaving no trace. There is just one clue about him.. he had a son named Gabyze. He had written his son name all over the town but still no one find them yet. Not until..

Year 191, two years passed along the continuation of the crime. A witnessed appeared. Mickele Rodrigoz, a rumored friend of him. The process of finding him was really close to the success, they found his secret base, the knifes that used for Murdering and the small family picture that can clearly see his sons face but the killer still nowhere to be found as well his son. As the investigation continue, the precious key to the justice.. was also found..

...dead... along with the boy that was called his son.