Pichushkin, now 50 years old, targeted his victims, often homeless people, alcoholics and the elderly, around Bitsevsky Park, a large green place in southern Moscow. His killings lasted from 1992 to 2006.
Pichushkin has been held at the Polar Owl prison, in Russia's remote Arctic north, since being sentenced.
Pichushkin has long been suspected of additional murders to those for which he was convicted.
If convicted of the additional murders, it would make Pichushkin Russia's second most prolific serial killer on record, behind Mikhail Popkov, a former policeman convicted of 78 murders.
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