Write a summary of the character Katurian

Katurian is a writer whose writing is based on Franz Kafka/The Brothers Grimm and character is based of Josef K. from The Trial by Kafka, who is charged with killing three children that parallel his stories which are about child murderers. He is close to his brain-damaged older brother, Michal. He claims he is innocent, and turns out to be so after he finds out his brother killed the kids, who was influenced by his stories. He wanted to spare him from being executed by the police, so he killed Michal himself with a pillow. He has only published one story. Detective Tupolski wants to burn his stories after his execution but Detective Ariel secretly saves them. He serves as a narrator of the short stories in the play, mostly writing unhappy endings. He later confesses to six killings (the three kids, his parents, and his brother) on the condition his stories are saved.