The crime was committed at 7:43 pm on October 25, 2019 in the town of Shahriar near the capital, Tehran.\r\n\r\nThe 18-year-old boy entered the local police station with injured hands, looking disturbed. He asked for help in a loud voice.\r\n\r\n\u201cA masked man jumped down the wall into our house and killed my family. He wanted to kill me, too, but I managed to escape,\u201d said the boy.\r\n\r\nAfter hearing these shocking remarks, police officers immediately went to his home with him only to find the lifeless bodies of the boy\u2019s father, mother and younger brother, who had been stabbed several times.\r\n\r\nInspectors began to interrogate the boy, called Amir-Abbas, as the prime suspect. After a few hours, he confessed to killing his 45-year-old father, Ali, 44-year-old mother, Habibeh, as well as Amir-Ali, his younger brother who was only 13 years of age.\r\n\r\n\u201cBased on the confessions of this young boy, he had premeditated the murder out of grudge, jealousy, despair, and his parents\u2019 discrimination in favour of his brother,\u201d said a senior police official.\r\n\r\nIn an interview, Amir-Abbas said his family did not like him, but loved his brother.\r\n\r\n\u201cI hated them all,\u201d said Amir-Abbas, who is a high school student.\r\n\r\n\u201cMy father called me a worthless leech,\u201d he added.\r\n\r\n\u201cI had been thinking on how to kill my father for a year. Once, I wanted to pour industrial alcohol into his drink, but I was afraid he might stay alive. When there was talk of the murder of Khashoggi, I thought I could kill my father the same way, so that no trace would be left of him, but I changed my mind later,\u201d he said.\r\n\r\n\u201cIt was around 4:30. My father was out and my mother had gone to a religious ceremony. I wasn\u2019t able to kill them all together because they would make a noise. So, when I found my brother alone, I stabbed him 20 times and hid his body in the bathroom. Then I waited for my father to come home. Then I took him by surprise from behind and stabbed him to death.\u201d\r\n\r\n\u201cAt that moment, I had a sense of victory. I threw his body into the bedroom. An hour later, my mother got back home and I killed her in the yard. I didn\u2019t hate her, but I had to finish it,\u201d he said.\r\n\r\nPsychological tests conducted on Amir-Abbas show he suffers from Schizoid Personality Disorder. People suffering from this condition are emotionally cold and hold themselves aloof from their families.