Oleg grew up closed and unsociable, and was inclined antisocial behaviour; for example, burning the door of a neighbor's house or destroying school textbooks.
Zaikin was under a written undertaking not to leave his home, but disappeared, and was declared wanted as a federal criminal.
The first murder Zaikin committed was killing his female roommate in Chelyabinsk, a year after fleeing from his house.
In April 2006, Zaikin committed another murder in Orenburg, and in May, he killed a 49-year-old woman and 16-year-old teenager in Kazan.
Zaikin would climb in from first floor windows, and would wrap his fingers with adhesive tape so as not to leave fingerprints.
Zaikin was identified quickly enough, but due to his roaming criminal ways, he was not arrested for a long time.
[2] In his apartment, a hunting knife measuring 26 centimeters was found, a pack of condoms used during rapes, and, most unusually, an icon.