Editing Andrei Chikatilo (section)

===Final murder===
On 6 November 1990, Chikatilo killed and mutilated a 22-year-old woman, Svetlana Korostik, in woodland near Donleskhoz station.{{sfn|Cullen|1994|p=169}} Returning to the railway platform, he was noticed by an undercover officer named Igor Rybakov,{{sfn|Cullen|1994|p=171}} who observed Chikatilo approach a well and wash his hands and face.{{sfn|Cullen|1994|p=171}} When he approached the station, Rybakov also noted that Chikatilo's coat had grass and soil stains on the elbows; Chikatilo also had a small red smear on his cheek and what appeared to be a severe wound on one of his fingers.{{sfn|Conradi|1992|p=186}} To Rybakov, he looked suspicious. The only reason people entered the woodland near Donleskhoz station at that time of year was to gather wild mushrooms (a popular pastime in Russia), but Chikatilo was not dressed like a typical forest scavenger; he was wearing more formal attire. Moreover, he had a nylon sports bag, which was unsuitable for carrying mushrooms.{{sfn|Krivich|1993|p=243}} Rybakov stopped Chikatilo and checked his papers, but had no formal reason to arrest him.{{sfn|Cullen|1994|p=171}}<ref name="CanberaTimes"/> When Rybakov returned to his office, he filed a routine report, containing the name of the person he had stopped at the station and the possible blood smear observed upon his cheek.{{sfn|Conradi|1992|p=187}}

On 13 November, Korostik's body was found; she was the thirty-eighth victim linked to the manhunt. Police summoned the officer in charge of surveillance at Donleskhoz station and examined the reports of all men stopped and questioned in the previous week.{{sfn|Cullen|1994|p=170}} Not only was Chikatilo's name among those reports, but it was familiar to several officers involved in the case because he had been questioned in 1984 and had been placed upon a 1987 suspect list compiled and distributed throughout the Soviet Union.{{sfn|Cullen|1994|pp=170–171}} After checking with Chikatilo's present and previous employers, investigators were able to place him in various towns and cities at times when several victims linked to the investigation had been murdered.{{sfn|Cullen|1994|p=207}} Questioning of former colleagues from Chikatilo's teaching days revealed that he had been forced to resign from two teaching positions due to repeated complaints of lewd behaviour and sexual assault made by his pupils.{{sfn|Cullen|1994|p=172}}