On March 27, 1951, a letter penned by a local butcher named Ali Akbar Khan Khosravi was sent to Col. Mohammad Khatami, the Police Chief of the Khorasan Municipality Directorate. In it, Khosravi stated that while he was passing by the Abkoh Sugar Factory he came across what appeared to be the body of a dead woman, and asked for the police to investigate it. They soon located a woman named Goltaban who claimed that Orangi had attempted to rape and strangle her, but that she screamed for help and was saved by two passers-by. On April 7, two detectives and one constable dressed in casual clothing and went to an
opium den in the Zabliha neighbourhood, where Orangi was known to reside. Now faced with contradicting accounts, interrogators asked Orangi repeatedly to tell the truth, with him eventually saying that he was willing to confess what had truly happened if they allowed him to write down his crimes, recite poems and smoke opium. Deciding to listen to his demands, the interrogators obliged, after which Orangi wrote down a detailed confession of how he had killed Noghani. This was later compared with Zarifian's confessions, and upon further review, investigators came to the conclusion that Orangi was the main killer while Zarifian acted as an accomplice. In his written confessions, Orangi stated that he wanted to rid the world of corruption, in addition to seeking infamy out of the terrible crimes he committed. Due to the fact that he sometimes sang songs to the victims before killing them, he was nicknamed "The Singing Killer" (Persian: قاتل آوازهخوان). == Death sentence and execution ==